[{"intvolume":"       108","file":[{"relation":"main_file","access_level":"open_access","checksum":"f763000339b5fd543c14377109920690","creator":"dernst","date_updated":"2023-08-07T09:48:08Z","content_type":"application/pdf","file_id":"13981","success":1,"file_size":3051398,"date_created":"2023-08-07T09:48:08Z","file_name":"2023_PhysRevB_Brighi.pdf"}],"issue":"5","external_id":{"arxiv":["2303.16876"]},"oa_version":"Published Version","_id":"13963","status":"public","publisher":"American Physical Society","citation":{"ieee":"P. Brighi, M. Ljubotina, D. A. Abanin, and M. Serbyn, “Many-body localization proximity effect in a two-species bosonic Hubbard model,” <i>Physical Review B</i>, vol. 108, no. 5. American Physical Society, 2023.","apa":"Brighi, P., Ljubotina, M., Abanin, D. A., &#38; Serbyn, M. (2023). Many-body localization proximity effect in a two-species bosonic Hubbard model. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.108.054201\">https://doi.org/10.1103/physrevb.108.054201</a>","ista":"Brighi P, Ljubotina M, Abanin DA, Serbyn M. 2023. Many-body localization proximity effect in a two-species bosonic Hubbard model. Physical Review B. 108(5), 054201.","ama":"Brighi P, Ljubotina M, Abanin DA, Serbyn M. Many-body localization proximity effect in a two-species bosonic Hubbard model. <i>Physical Review B</i>. 2023;108(5). doi:<a href=\"https://doi.org/10.1103/physrevb.108.054201\">10.1103/physrevb.108.054201</a>","short":"P. Brighi, M. Ljubotina, D.A. Abanin, M. Serbyn, Physical Review B 108 (2023).","mla":"Brighi, Pietro, et al. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” <i>Physical Review B</i>, vol. 108, no. 5, 054201, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physrevb.108.054201\">10.1103/physrevb.108.054201</a>.","chicago":"Brighi, Pietro, Marko Ljubotina, Dmitry A. Abanin, and Maksym Serbyn. “Many-Body Localization Proximity Effect in a Two-Species Bosonic Hubbard Model.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physrevb.108.054201\">https://doi.org/10.1103/physrevb.108.054201</a>."},"year":"2023","acknowledgement":"We thank A. A. Michailidis and A. Mirlin for insightful discussions. P.B., M.L., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was\r\nsupported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597) and by the Swiss National Science Foundation. P.B., M.L., and M.S. acknowledge PRACE for awarding us access to Joliot-Curie at GENCI@CEA, France, where the TEBD simulations were performed. The TEBD simulations were performed using the ITensor library [60].","arxiv":1,"day":"01","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"fulldoi":"https://doi.org/10.1103/physrevb.108.054201","article_type":"original","has_accepted_license":"1","date_published":"2023-08-01T00:00:00Z","ddc":["530"],"date_updated":"2025-04-14T07:52:06Z","abstract":[{"text":"The many-body localization (MBL) proximity effect is an intriguing phenomenon where a thermal bath localizes due to the interaction with a disordered system. The interplay of thermal and nonergodic behavior in these systems gives rise to a rich phase diagram, whose exploration is an active field of research. In this paper, we study a bosonic Hubbard model featuring two particle species representing the bath and the disordered system. Using state-of-the-art numerical techniques, we investigate the dynamics of the model in different regimes, based on which we obtain a tentative phase diagram as a function of coupling strength and bath size. When the bath is composed of a single particle, we observe clear signatures of a transition from an MBL proximity effect to a delocalized phase. Increasing the bath size, however, its thermalizing effect becomes stronger and eventually the whole system delocalizes in the range of moderate interaction strengths studied. In this regime, we characterize particle transport, revealing diffusive behavior of the originally localized bosons.","lang":"eng"}],"file_date_updated":"2023-08-07T09:48:08Z","ec_funded":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_processing_charge":"Yes (in subscription journal)","date_created":"2023-08-05T18:25:22Z","quality_controlled":"1","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","grant_number":"850899"}],"publication_status":"published","department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"volume":108,"license":"https://creativecommons.org/licenses/by/4.0/","month":"08","type":"journal_article","doi":"10.1103/physrevb.108.054201","title":"Many-body localization proximity effect in a two-species bosonic Hubbard model","oa":1,"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"article_number":"054201","scopus_import":"1","corr_author":"1","author":[{"orcid":"0000-0002-7969-2729","first_name":"Pietro","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","last_name":"Brighi","full_name":"Brighi, Pietro"},{"first_name":"Marko","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","last_name":"Ljubotina"},{"last_name":"Abanin","full_name":"Abanin, Dmitry A.","first_name":"Dmitry A."},{"orcid":"0000-0002-2399-5827","first_name":"Maksym","full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"publication":"Physical Review B"},{"date_updated":"2023-09-20T09:38:24Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","abstract":[{"lang":"eng","text":"The development of two-dimensional materials has resulted in a diverse range of novel, high-quality compounds with increasing complexity. A key requirement for a comprehensive quantitative theory is the accurate determination of these materials' band structure parameters. However, this task is challenging due to the intricate band structures and the indirect nature of experimental probes. In this work, we introduce a general framework to derive band structure parameters from experimental data using deep neural networks. We applied our method to the penetration field capacitance measurement of trilayer graphene, an effective probe of its density of states. First, we demonstrate that a trained deep network gives accurate predictions for the penetration field capacitance as a function of tight-binding parameters. Next, we use the fast and accurate predictions from the trained network to automatically determine tight-binding parameters directly from experimental data, with extracted parameters being in a good agreement with values in the literature. We conclude by discussing potential applications of our method to other materials and experimental techniques beyond penetration field capacitance."}],"date_published":"2023-09-15T00:00:00Z","fulldoi":"https://doi.org/10.1103/physrevb.108.125411","article_type":"original","_id":"14320","status":"public","oa_version":"Preprint","day":"15","arxiv":1,"publisher":"American Physical Society","acknowledgement":"A.F.Y. acknowledges primary support from the Department of Energy under award DE-SC0020043, and additional support from the Gordon and Betty Moore Foundation under award GBMF9471 for group operations.","year":"2023","citation":{"mla":"Henderson, Paul M., et al. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” <i>Physical Review B</i>, vol. 108, no. 12, 125411, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physrevb.108.125411\">10.1103/physrevb.108.125411</a>.","short":"P.M. Henderson, A. Ghazaryan, A.A. Zibrov, A.F. Young, M. Serbyn, Physical Review B 108 (2023).","chicago":"Henderson, Paul M, Areg Ghazaryan, Alexander A. Zibrov, Andrea F. Young, and Maksym Serbyn. “Deep Learning Extraction of Band Structure Parameters from Density of States: A Case Study on Trilayer Graphene.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physrevb.108.125411\">https://doi.org/10.1103/physrevb.108.125411</a>.","apa":"Henderson, P. M., Ghazaryan, A., Zibrov, A. A., Young, A. F., &#38; Serbyn, M. (2023). Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.108.125411\">https://doi.org/10.1103/physrevb.108.125411</a>","ieee":"P. M. Henderson, A. Ghazaryan, A. A. Zibrov, A. F. Young, and M. Serbyn, “Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene,” <i>Physical Review B</i>, vol. 108, no. 12. American Physical Society, 2023.","ista":"Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. 2023. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. Physical Review B. 108(12), 125411.","ama":"Henderson PM, Ghazaryan A, Zibrov AA, Young AF, Serbyn M. Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene. <i>Physical Review B</i>. 2023;108(12). doi:<a href=\"https://doi.org/10.1103/physrevb.108.125411\">10.1103/physrevb.108.125411</a>"},"issue":"12","external_id":{"arxiv":["2210.06310"]},"intvolume":"       108","scopus_import":"1","publication":"Physical Review B","author":[{"full_name":"Henderson, Paul M","id":"13C09E74-18D9-11E9-8878-32CFE5697425","last_name":"Henderson","orcid":"0000-0002-5198-7445","first_name":"Paul M"},{"orcid":"0000-0001-9666-3543","first_name":"Areg","full_name":"Ghazaryan, Areg","last_name":"Ghazaryan","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Alexander A.","last_name":"Zibrov","full_name":"Zibrov, Alexander A."},{"first_name":"Andrea F.","last_name":"Young","full_name":"Young, Andrea F."},{"last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym","orcid":"0000-0002-2399-5827"}],"oa":1,"title":"Deep learning extraction of band structure parameters from density of states: A case study on trilayer graphene","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"type":"journal_article","doi":"10.1103/physrevb.108.125411","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2210.06310","open_access":"1"}],"article_number":"125411","publication_status":"published","department":[{"_id":"MaSe"},{"_id":"ChLa"},{"_id":"MiLe"}],"language":[{"iso":"eng"}],"volume":108,"month":"09","article_processing_charge":"No","date_created":"2023-09-12T07:12:12Z","quality_controlled":"1"},{"has_accepted_license":"1","date_published":"2023-09-13T00:00:00Z","ddc":["530"],"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"keyword":["General Physics and Astronomy"],"article_type":"original","fulldoi":"https://doi.org/10.21468/scipostphys.15.3.093","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","file_date_updated":"2023-09-20T10:46:10Z","abstract":[{"text":"Quantum kinetically constrained models have recently attracted significant attention due to their anomalous dynamics and thermalization. In this work, we introduce a hitherto unexplored family of kinetically constrained models featuring conserved particle number and strong inversion-symmetry breaking due to facilitated hopping. We demonstrate that these models provide a generic example of so-called quantum Hilbert space fragmentation, that is manifested in disconnected sectors in the Hilbert space that are not apparent in the computational basis. Quantum Hilbert space fragmentation leads to an exponential in system size number of eigenstates with exactly zero entanglement entropy across several bipartite cuts. These eigenstates can be probed dynamically using quenches from simple initial product states. In addition, we study the particle spreading under unitary dynamics launched from the domain wall state, and find faster than diffusive dynamics at high particle densities, that crosses over into logarithmically slow relaxation at smaller densities. Using a classically simulable cellular automaton, we reproduce the logarithmic dynamics observed in the quantum case. Our work suggests that particle conserving constrained models with inversion symmetry breaking realize so far unexplored dynamical behavior and invite their further theoretical and experimental studies.","lang":"eng"}],"ec_funded":1,"date_updated":"2025-04-14T07:52:05Z","issue":"3","external_id":{"arxiv":["2210.15607"]},"intvolume":"        15","file":[{"creator":"dernst","date_updated":"2023-09-20T10:46:10Z","content_type":"application/pdf","checksum":"4cef6a8021f6b6c47ab2f2f2b1387ac2","access_level":"open_access","relation":"main_file","file_size":4866506,"date_created":"2023-09-20T10:46:10Z","file_name":"2023_SciPostPhysics_Brighi.pdf","success":1,"file_id":"14350"}],"day":"13","arxiv":1,"publisher":"SciPost Foundation","citation":{"apa":"Brighi, P., Ljubotina, M., &#38; Serbyn, M. (2023). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>SciPost Physics</i>. SciPost Foundation. <a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">https://doi.org/10.21468/scipostphys.15.3.093</a>","ieee":"P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” <i>SciPost Physics</i>, vol. 15, no. 3. SciPost Foundation, 2023.","ista":"Brighi P, Ljubotina M, Serbyn M. 2023. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. SciPost Physics. 15(3), 093.","ama":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>SciPost Physics</i>. 2023;15(3). doi:<a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">10.21468/scipostphys.15.3.093</a>","short":"P. Brighi, M. Ljubotina, M. Serbyn, SciPost Physics 15 (2023).","mla":"Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>SciPost Physics</i>, vol. 15, no. 3, 093, SciPost Foundation, 2023, doi:<a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">10.21468/scipostphys.15.3.093</a>.","chicago":"Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>SciPost Physics</i>. SciPost Foundation, 2023. <a href=\"https://doi.org/10.21468/scipostphys.15.3.093\">https://doi.org/10.21468/scipostphys.15.3.093</a>."},"year":"2023","acknowledgement":"We would like to thank Raimel A. Medina, Hansveer Singh, and Dmitry Abanin for useful\r\ndiscussions.The authors acknowledge support by the European Research Council\r\n(ERC) under the European Union’s Horizon 2020 research and innovation program (Grant\r\nAgreement No. 850899). We acknowledge support by the Erwin Schrödinger International\r\nInstitute for Mathematics and Physics (ESI).","status":"public","_id":"14334","oa_version":"Published Version","article_number":"093","oa":1,"title":"Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models","publication_identifier":{"issn":["2542-4653"]},"type":"journal_article","doi":"10.21468/scipostphys.15.3.093","publication":"SciPost Physics","author":[{"last_name":"Brighi","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","first_name":"Pietro"},{"first_name":"Marko","orcid":"0000-0003-0038-7068","full_name":"Ljubotina, Marko","last_name":"Ljubotina","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"orcid":"0000-0002-2399-5827","first_name":"Maksym","full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"}],"corr_author":"1","scopus_import":"1","project":[{"grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020"}],"related_material":{"record":[{"status":"public","relation":"earlier_version","id":"12750"}]},"quality_controlled":"1","article_processing_charge":"No","date_created":"2023-09-14T13:08:23Z","month":"09","publication_status":"published","volume":15,"department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}]},{"publication":"Physical Review B","author":[{"full_name":"Babkin, Serafim","last_name":"Babkin","id":"41e64307-6672-11ee-b9ad-cc7a0075a479","orcid":"0009-0003-7382-8036","first_name":"Serafim"},{"full_name":"Karcher, Jonas F.","last_name":"Karcher","first_name":"Jonas F."},{"first_name":"Igor S.","last_name":"Burmistrov","full_name":"Burmistrov, Igor S."},{"first_name":"Alexander D.","full_name":"Mirlin, Alexander D.","last_name":"Mirlin"}],"scopus_import":"1","article_number":"104205","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"oa":1,"title":"Generalized surface multifractality in two-dimensional disordered systems","doi":"10.1103/PhysRevB.108.104205","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2306.09455","open_access":"1"}],"type":"journal_article","month":"09","language":[{"iso":"eng"}],"volume":108,"department":[{"_id":"MaSe"}],"publication_status":"published","quality_controlled":"1","date_created":"2023-10-08T22:01:17Z","article_processing_charge":"No","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","abstract":[{"lang":"eng","text":"Recently, a concept of generalized multifractality, which characterizes fluctuations and correlations of critical eigenstates, was introduced and explored for all 10 symmetry classes of disordered systems. Here, by using the nonlinear sigma-model (\r\nNL\r\nσ\r\nM\r\n) field theory, we extend the theory of generalized multifractality to boundaries of systems at criticality. Our numerical simulations on two-dimensional systems of symmetry classes A, C, and AII fully confirm the analytical predictions of pure-scaling observables and Weyl symmetry relations between critical exponents of surface generalized multifractality. This demonstrates the validity of the \r\nNL\r\nσ\r\nM\r\n for the description of Anderson-localization critical phenomena, not only in the bulk but also on the boundary. The critical exponents strongly violate generalized parabolicity, in analogy with earlier results for the bulk, corroborating the conclusion that the considered Anderson-localization critical points are not described by conformal field theories. We further derive relations between generalized surface multifractal spectra and linear combinations of Lyapunov exponents of a strip in quasi-one-dimensional geometry, which hold under the assumption of invariance with respect to a logarithmic conformal map. Our numerics demonstrate that these relations hold with an excellent accuracy. Taken together, our results indicate an intriguing situation: the conformal invariance is broken but holds partially at critical points of Anderson localization."}],"date_updated":"2025-09-09T13:03:44Z","date_published":"2023-09-01T00:00:00Z","fulldoi":"https://doi.org/10.1103/PhysRevB.108.104205","article_type":"original","day":"01","arxiv":1,"isi":1,"citation":{"ieee":"S. Babkin, J. F. Karcher, I. S. Burmistrov, and A. D. Mirlin, “Generalized surface multifractality in two-dimensional disordered systems,” <i>Physical Review B</i>, vol. 108, no. 10. American Physical Society, 2023.","apa":"Babkin, S., Karcher, J. F., Burmistrov, I. S., &#38; Mirlin, A. D. (2023). Generalized surface multifractality in two-dimensional disordered systems. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.108.104205\">https://doi.org/10.1103/PhysRevB.108.104205</a>","ama":"Babkin S, Karcher JF, Burmistrov IS, Mirlin AD. Generalized surface multifractality in two-dimensional disordered systems. <i>Physical Review B</i>. 2023;108(10). doi:<a href=\"https://doi.org/10.1103/PhysRevB.108.104205\">10.1103/PhysRevB.108.104205</a>","ista":"Babkin S, Karcher JF, Burmistrov IS, Mirlin AD. 2023. Generalized surface multifractality in two-dimensional disordered systems. Physical Review B. 108(10), 104205.","short":"S. Babkin, J.F. Karcher, I.S. Burmistrov, A.D. Mirlin, Physical Review B 108 (2023).","mla":"Babkin, Serafim, et al. “Generalized Surface Multifractality in Two-Dimensional Disordered Systems.” <i>Physical Review B</i>, vol. 108, no. 10, 104205, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevB.108.104205\">10.1103/PhysRevB.108.104205</a>.","chicago":"Babkin, Serafim, Jonas F. Karcher, Igor S. Burmistrov, and Alexander D. Mirlin. “Generalized Surface Multifractality in Two-Dimensional Disordered Systems.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevB.108.104205\">https://doi.org/10.1103/PhysRevB.108.104205</a>."},"year":"2023","acknowledgement":"We thank Ilya Gruzberg for many illuminating discussions. S.S.B., J.F.K., and A.D.M. acknowledge support by the Deutsche Forschungsgemeinschaft (DFG) via the Grant\r\nNo. MI 658/14-1. I.S.B. acknowledges support from Russian Science Foundation (Grant No. 22-42-04416).","publisher":"American Physical Society","status":"public","_id":"14406","oa_version":"Preprint","external_id":{"isi":["001186160100001"],"arxiv":["2306.09455"]},"issue":"10","intvolume":"       108"},{"date_created":"2023-12-17T23:00:53Z","article_processing_charge":"No","quality_controlled":"1","volume":108,"language":[{"iso":"eng"}],"department":[{"_id":"MaSe"}],"publication_status":"published","month":"11","publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"oa":1,"title":"Boundary multifractality in the spin quantum Hall symmetry class with interaction","main_file_link":[{"url":" https://doi.org/10.48550/arXiv.2308.16852","open_access":"1"}],"doi":"10.1103/PhysRevB.108.205429","type":"journal_article","article_number":"205429","corr_author":"1","scopus_import":"1","publication":"Physical Review B","author":[{"orcid":"0009-0003-7382-8036","first_name":"Serafim","last_name":"Babkin","id":"41e64307-6672-11ee-b9ad-cc7a0075a479","full_name":"Babkin, Serafim"},{"first_name":"I","last_name":"Burmistrov","full_name":"Burmistrov, I"}],"external_id":{"arxiv":["2308.16852"],"isi":["001141678200003"]},"issue":"20","intvolume":"       108","_id":"14690","status":"public","oa_version":"Preprint","arxiv":1,"day":"15","isi":1,"year":"2023","acknowledgement":"The authors are grateful to J. Karcher and A. Mirlin for collaboration on the related project. We thank I. Gruzberg and A. Mirlin for useful discussions and comments. I.S.B. is grateful to M. Parfenov and P. Ostrovsky for collaboration on the related project. The research was supported by Russian Science Foundation (Grant No. 22-42-04416).","citation":{"chicago":"Babkin, Serafim, and I Burmistrov. “Boundary Multifractality in the Spin Quantum Hall Symmetry Class with Interaction.” <i>Physical Review B</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/PhysRevB.108.205429\">https://doi.org/10.1103/PhysRevB.108.205429</a>.","mla":"Babkin, Serafim, and I. Burmistrov. “Boundary Multifractality in the Spin Quantum Hall Symmetry Class with Interaction.” <i>Physical Review B</i>, vol. 108, no. 20, 205429, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/PhysRevB.108.205429\">10.1103/PhysRevB.108.205429</a>.","short":"S. Babkin, I. Burmistrov, Physical Review B 108 (2023).","ama":"Babkin S, Burmistrov I. Boundary multifractality in the spin quantum Hall symmetry class with interaction. <i>Physical Review B</i>. 2023;108(20). doi:<a href=\"https://doi.org/10.1103/PhysRevB.108.205429\">10.1103/PhysRevB.108.205429</a>","ista":"Babkin S, Burmistrov I. 2023. Boundary multifractality in the spin quantum Hall symmetry class with interaction. Physical Review B. 108(20), 205429.","ieee":"S. Babkin and I. Burmistrov, “Boundary multifractality in the spin quantum Hall symmetry class with interaction,” <i>Physical Review B</i>, vol. 108, no. 20. American Physical Society, 2023.","apa":"Babkin, S., &#38; Burmistrov, I. (2023). Boundary multifractality in the spin quantum Hall symmetry class with interaction. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.108.205429\">https://doi.org/10.1103/PhysRevB.108.205429</a>"},"publisher":"American Physical Society","date_published":"2023-11-15T00:00:00Z","fulldoi":"https://doi.org/10.1103/PhysRevB.108.205429","article_type":"original","date_updated":"2025-09-09T14:00:09Z","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","abstract":[{"lang":"eng","text":"Generalized multifractality characterizes system size dependence of pure scaling local observables at Anderson transitions in all 10 symmetry classes of disordered systems. Recently, the concept of generalized multifractality has been extended to boundaries of critical disordered noninteracting systems. Here we study the generalized boundary multifractality in the presence of electron-electron interaction, focusing on the spin quantum Hall symmetry class (class C). Employing the two-loop renormalization group analysis within the Finkel'stein nonlinear sigma model, we compute the anomalous dimensions of the pure scaling operators located at the boundary of the system. We find that generalized boundary multifractal exponents are twice larger than their bulk counterparts. Exact symmetry relations between generalized boundary multifractal exponents in the case of noninteracting systems are explicitly broken by the interaction."}]},{"oa":1,"title":"Improving variational quantum algorithms: Innovative initialization techniques and extensions to qudit systems","publication_identifier":{"issn":["2663-337X"]},"type":"dissertation","doi":"10.15479/at:ista:14622","doi_confirm":"1","corr_author":"1","author":[{"first_name":"Stefan","orcid":"0000-0001-5400-8508","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","last_name":"Sack","full_name":"Sack, Stefan"}],"article_processing_charge":"No","date_created":"2023-11-28T10:58:13Z","degree_awarded":"PhD","project":[{"_id":"bd660c93-d553-11ed-ba76-fb0fb6f49c0d","name":"IBM PhD Nomination Fellowship - Stefan Sack"},{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","grant_number":"850899"}],"related_material":{"record":[{"status":"public","id":"13125","relation":"part_of_dissertation"},{"relation":"part_of_dissertation","id":"11471","status":"public"},{"status":"public","id":"9760","relation":"part_of_dissertation"}]},"page":"142","publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"GradSch"},{"_id":"MaSe"}],"month":"11","license":"https://creativecommons.org/licenses/by-nc-sa/4.0/","has_accepted_license":"1","date_published":"2023-11-30T00:00:00Z","ddc":["530"],"tmp":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png"},"fulldoi":"https://doi.org/10.15479/at:ista:14622","OA_place":"publisher","date_updated":"2026-09-14T08:36:32Z","alternative_title":["ISTA Thesis"],"user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","file_date_updated":"2024-11-30T23:30:03Z","ec_funded":1,"abstract":[{"text":"This Ph.D. thesis presents a detailed investigation into Variational Quantum Algorithms\r\n(VQAs), a promising class of quantum algorithms that are well suited for near-term quantum\r\ncomputation due to their moderate hardware requirements and resilience to noise. Our\r\nprimary focus lies on two particular types of VQAs: the Quantum Approximate Optimization\r\nAlgorithm (QAOA), used for solving binary optimization problems, and the Variational Quantum\r\nEigensolver (VQE), utilized for finding ground states of quantum many-body systems.\r\nIn the first part of the thesis, we examine the issue of effective parameter initialization for\r\nthe QAOA. The work demonstrates that random initialization of the QAOA often leads to\r\nconvergence in local minima with sub-optimal performance. To mitigate this issue, we propose\r\nan initialization of QAOA parameters based on the Trotterized Quantum Annealing (TQA).\r\nWe show that TQA initialization leads to the same performance as the best of an exponentially\r\nscaling number of random initializations.\r\nThe second study introduces Transition States (TS), stationary points with a single direction\r\nof descent, as a tool for systematically exploring the QAOA optimization landscape. This\r\nleads us to propose a novel greedy parameter initialization strategy that guarantees for the\r\nenergy to decrease with increasing number of circuit layers.\r\nIn the third section, we extend the QAOA to qudit systems, which are higher-dimensional\r\ngeneralizations of qubits. This chapter provides theoretical insights and practical strategies for\r\nleveraging the increased computational power of qudits in the context of quantum optimization\r\nalgorithms and suggests a quantum circuit for implementing the algorithm on an ion trap\r\nquantum computer.\r\nFinally, we propose an algorithm to avoid “barren plateaus”, regions in parameter space with\r\nvanishing gradients that obstruct efficient parameter optimization. This novel approach relies\r\non defining a notion of weak barren plateaus based on the entropies of local reduced density\r\nmatrices and showcases how these can be efficiently quantified using shadow tomography.\r\nTo illustrate the approach we employ the strategy in the VQE and show that it allows to\r\nsuccessfully avoid barren plateaus in the initialization and throughout the optimization.\r\nTaken together, this thesis greatly enhances our understanding of parameter initialization and\r\noptimization in VQAs, expands the scope of QAOA to higher-dimensional quantum systems,\r\nand presents a method to address the challenge of barren plateaus using the VQE. These\r\ninsights are instrumental in advancing the field of near-term quantum computation.","lang":"eng"}],"file":[{"creator":"ssack","content_type":"application/pdf","date_updated":"2024-11-30T23:30:03Z","relation":"main_file","access_level":"open_access","checksum":"068fd3570506ec42b2faa390de784bc4","embargo":"2024-11-30","date_created":"2023-11-30T15:53:10Z","file_size":11947523,"file_name":"PhD_Thesis.pdf","file_id":"14635"},{"file_id":"14636","embargo_to":"open_access","file_name":"PhD Thesis (1).zip","file_size":18422964,"date_created":"2023-11-30T15:54:11Z","relation":"source_file","access_level":"closed","checksum":"0fa3bc0d108aed0ac59d2c6beef2220a","content_type":"application/zip","date_updated":"2024-11-30T23:30:03Z","creator":"ssack"}],"_id":"14622","status":"public","oa_version":"Published Version","supervisor":[{"full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","orcid":"0000-0002-2399-5827","first_name":"Maksym"}],"day":"30","publisher":"Institute of Science and Technology Austria","year":"2023","citation":{"short":"S. Sack, Improving Variational Quantum Algorithms: Innovative Initialization Techniques and Extensions to Qudit Systems, Institute of Science and Technology Austria, 2023.","mla":"Sack, Stefan. <i>Improving Variational Quantum Algorithms: Innovative Initialization Techniques and Extensions to Qudit Systems</i>. Institute of Science and Technology Austria, 2023, doi:<a href=\"https://doi.org/10.15479/at:ista:14622\">10.15479/at:ista:14622</a>.","chicago":"Sack, Stefan. “Improving Variational Quantum Algorithms: Innovative Initialization Techniques and Extensions to Qudit Systems.” Institute of Science and Technology Austria, 2023. <a href=\"https://doi.org/10.15479/at:ista:14622\">https://doi.org/10.15479/at:ista:14622</a>.","apa":"Sack, S. (2023). <i>Improving variational quantum algorithms: Innovative initialization techniques and extensions to qudit systems</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/at:ista:14622\">https://doi.org/10.15479/at:ista:14622</a>","ieee":"S. Sack, “Improving variational quantum algorithms: Innovative initialization techniques and extensions to qudit systems,” Institute of Science and Technology Austria, 2023.","ama":"Sack S. Improving variational quantum algorithms: Innovative initialization techniques and extensions to qudit systems. 2023. doi:<a href=\"https://doi.org/10.15479/at:ista:14622\">10.15479/at:ista:14622</a>","ista":"Sack S. 2023. Improving variational quantum algorithms: Innovative initialization techniques and extensions to qudit systems. Institute of Science and Technology Austria."}},{"date_created":"2023-06-07T06:57:32Z","article_processing_charge":"No","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","grant_number":"850899"}],"quality_controlled":"1","related_material":{"record":[{"relation":"dissertation_contains","id":"17208","status":"public"},{"status":"public","id":"14622","relation":"dissertation_contains"}]},"department":[{"_id":"MaSe"}],"volume":107,"language":[{"iso":"eng"}],"publication_status":"published","month":"06","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"oa":1,"title":"Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement","doi":"10.1103/physreva.107.062404","type":"journal_article","article_number":"062404","corr_author":"1","scopus_import":"1","publication":"Physical Review A","author":[{"id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","last_name":"Sack","full_name":"Sack, Stefan","orcid":"0000-0001-5400-8508","first_name":"Stefan"},{"id":"CE680B90-D85A-11E9-B684-C920E6697425","last_name":"Medina Ramos","full_name":"Medina Ramos, Raimel A","orcid":"0000-0002-5383-2869","first_name":"Raimel A"},{"full_name":"Kueng, Richard","last_name":"Kueng","first_name":"Richard"},{"orcid":"0000-0002-2399-5827","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym"}],"external_id":{"isi":["001016927100012"],"arxiv":["2209.01159"]},"issue":"6","file":[{"file_size":2524611,"date_created":"2023-06-13T07:28:36Z","file_name":"2023_PhysRevA_Sack.pdf","success":1,"file_id":"13131","creator":"dernst","content_type":"application/pdf","date_updated":"2023-06-13T07:28:36Z","checksum":"0d71423888eeccaa60d8f41197f26306","access_level":"open_access","relation":"main_file"}],"intvolume":"       107","status":"public","_id":"13125","oa_version":"Published Version","arxiv":1,"day":"02","isi":1,"citation":{"chicago":"Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” <i>Physical Review A</i>. American Physical Society, 2023. <a href=\"https://doi.org/10.1103/physreva.107.062404\">https://doi.org/10.1103/physreva.107.062404</a>.","short":"S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023).","mla":"Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm with Guaranteed Improvement.” <i>Physical Review A</i>, vol. 107, no. 6, 062404, American Physical Society, 2023, doi:<a href=\"https://doi.org/10.1103/physreva.107.062404\">10.1103/physreva.107.062404</a>.","ama":"Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. <i>Physical Review A</i>. 2023;107(6). doi:<a href=\"https://doi.org/10.1103/physreva.107.062404\">10.1103/physreva.107.062404</a>","ista":"Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. Physical Review A. 107(6), 062404.","apa":"Sack, S., Medina Ramos, R. A., Kueng, R., &#38; Serbyn, M. (2023). Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement. <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physreva.107.062404\">https://doi.org/10.1103/physreva.107.062404</a>","ieee":"S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization of the quantum approximate optimization algorithm with guaranteed improvement,” <i>Physical Review A</i>, vol. 107, no. 6. American Physical Society, 2023."},"acknowledgement":"We thank V. Verteletskyi for a joint collaboration on numerical studies of the QAOA during his internship at ISTA that inspired analytic results on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript. S.H.S., R.A.M., and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the project QuantumReady (FFG 896217). ","year":"2023","publisher":"American Physical Society","ddc":["530"],"has_accepted_license":"1","date_published":"2023-06-02T00:00:00Z","article_type":"original","fulldoi":"https://doi.org/10.1103/physreva.107.062404","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"date_updated":"2026-10-25T23:31:09Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","ec_funded":1,"abstract":[{"lang":"eng","text":"The quantum approximate optimization algorithm (QAOA) is a variational quantum algorithm, where a quantum computer implements a variational ansatz consisting of p layers of alternating unitary operators and a classical computer is used to optimize the variational parameters. For a random initialization, the optimization typically leads to local minima with poor performance, motivating the search for initialization strategies of QAOA variational parameters. Although numerous heuristic initializations exist, an analytical understanding and performance guarantees for large p remain evasive.We introduce a greedy initialization of QAOA which guarantees improving performance with an increasing number of layers. Our main result is an analytic construction of 2p + 1 transition states—saddle points with a unique negative curvature direction—for QAOA with p + 1 layers that use the local minimum of QAOA with p layers. Transition states connect to new local minima, which are guaranteed to lower the energy compared to the minimum found for p layers. We use the GREEDY procedure to navigate the exponentially increasing with p number of local minima resulting from the recursive application of our analytic construction. The performance of the GREEDY procedure matches available initialization strategies while providing a guarantee for the minimal energy to decrease with an increasing number of layers p. "}],"file_date_updated":"2023-06-13T07:28:36Z"},{"publication_status":"published","language":[{"iso":"eng"}],"department":[{"_id":"MaSe"},{"_id":"AnHi"}],"volume":128,"month":"03","article_processing_charge":"No","date_created":"2022-03-17T11:37:47Z","quality_controlled":"1","related_material":{"record":[{"status":"public","relation":"earlier_version","id":"10029"},{"id":"14547","relation":"dissertation_contains","status":"public"}],"link":[{"url":"https://ista.ac.at/en/news/characterizing-super-semi-sandwiches-for-quantum-computing/","description":"News on ISTA Website","relation":"press_release"}]},"project":[{"grant_number":"754411","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships"}],"scopus_import":"1","corr_author":"1","author":[{"first_name":"Duc T","last_name":"Phan","id":"29C8C0B4-F248-11E8-B48F-1D18A9856A87","full_name":"Phan, Duc T"},{"first_name":"Jorden L","orcid":"0000-0002-0672-9295","last_name":"Senior","id":"5479D234-2D30-11EA-89CC-40953DDC885E","full_name":"Senior, Jorden L"},{"full_name":"Ghazaryan, Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan","first_name":"Areg","orcid":"0000-0001-9666-3543"},{"full_name":"Hatefipour, M.","last_name":"Hatefipour","first_name":"M."},{"full_name":"Strickland, W. M.","last_name":"Strickland","first_name":"W. M."},{"first_name":"J.","last_name":"Shabani","full_name":"Shabani, J."},{"orcid":"0000-0002-2399-5827","first_name":"Maksym","full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"id":"4AD6785A-F248-11E8-B48F-1D18A9856A87","last_name":"Higginbotham","full_name":"Higginbotham, Andrew P","first_name":"Andrew P","orcid":"0000-0003-2607-2363"}],"publication":"Physical Review Letters","type":"journal_article","doi":"10.1103/physrevlett.128.107701","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2107.03695","open_access":"1"}],"title":"Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit","oa":1,"pmid":1,"publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"article_number":"107701","oa_version":"Preprint","_id":"10851","status":"public","publisher":"American Physical Society","acknowledgement":"M. S. acknowledges useful discussions with A. Levchenko and P. A. Lee, and E. Berg. This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility. J. S. and A. G. acknowledge funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 754411.W. M. Hatefipour, W. M. Strickland and J. Shabani acknowledge funding from Office of Naval Research Award No. N00014-21-1-2450.","citation":{"apa":"Phan, D. T., Senior, J. L., Ghazaryan, A., Hatefipour, M., Strickland, W. M., Shabani, J., … Higginbotham, A. P. (2022). Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.128.107701\">https://doi.org/10.1103/physrevlett.128.107701</a>","ieee":"D. T. Phan <i>et al.</i>, “Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit,” <i>Physical Review Letters</i>, vol. 128, no. 10. American Physical Society, 2022.","ama":"Phan DT, Senior JL, Ghazaryan A, et al. Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. <i>Physical Review Letters</i>. 2022;128(10). doi:<a href=\"https://doi.org/10.1103/physrevlett.128.107701\">10.1103/physrevlett.128.107701</a>","ista":"Phan DT, Senior JL, Ghazaryan A, Hatefipour M, Strickland WM, Shabani J, Serbyn M, Higginbotham AP. 2022. Detecting induced p±ip pairing at the Al-InAs interface with a quantum microwave circuit. Physical Review Letters. 128(10), 107701.","short":"D.T. Phan, J.L. Senior, A. Ghazaryan, M. Hatefipour, W.M. Strickland, J. Shabani, M. Serbyn, A.P. Higginbotham, Physical Review Letters 128 (2022).","mla":"Phan, Duc T., et al. “Detecting Induced P±ip Pairing at the Al-InAs Interface with a Quantum Microwave Circuit.” <i>Physical Review Letters</i>, vol. 128, no. 10, 107701, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevlett.128.107701\">10.1103/physrevlett.128.107701</a>.","chicago":"Phan, Duc T, Jorden L Senior, Areg Ghazaryan, M. Hatefipour, W. M. Strickland, J. Shabani, Maksym Serbyn, and Andrew P Higginbotham. “Detecting Induced P±ip Pairing at the Al-InAs Interface with a Quantum Microwave Circuit.” <i>Physical Review Letters</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevlett.128.107701\">https://doi.org/10.1103/physrevlett.128.107701</a>."},"year":"2022","isi":1,"arxiv":1,"day":"11","acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"intvolume":"       128","issue":"10","external_id":{"arxiv":["2107.03695"],"isi":["000771391100002"],"pmid":[" 35333085"]},"date_updated":"2026-04-07T13:25:51Z","ec_funded":1,"abstract":[{"lang":"eng","text":"Superconductor-semiconductor hybrid devices are at the heart of several proposed approaches to quantum information processing, but their basic properties remain to be understood. We embed a twodimensional Al-InAs hybrid system in a resonant microwave circuit, probing the breakdown of superconductivity due to an applied magnetic field. We find a fingerprint from the two-component nature of the hybrid system, and quantitatively compare with a theory that includes the contribution of intraband p±ip pairing in the InAs, as well as the emergence of Bogoliubov-Fermi surfaces due to magnetic field. Separately resolving the Al and InAs contributions allows us to determine the carrier density and mobility in the InAs."}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","keyword":["General Physics and Astronomy"],"article_type":"original","fulldoi":"https://doi.org/10.1103/physrevlett.128.107701","date_published":"2022-03-11T00:00:00Z"},{"date_created":"2022-03-18T10:20:46Z","article_processing_charge":"No","quality_controlled":"1","language":[{"iso":"eng"}],"volume":105,"department":[{"_id":"MaSe"}],"publication_status":"published","month":"03","doi":"10.1103/PhysRevB.105.L121407","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2101.08277","open_access":"1"}],"type":"journal_article","publication_identifier":{"issn":["2469-9969"]},"oa":1,"title":"Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials","article_number":"L121407","scopus_import":"1","author":[{"last_name":"Davydova","full_name":"Davydova, Margarita","first_name":"Margarita"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","first_name":"Maksym"},{"last_name":"Ishizuka","full_name":"Ishizuka, Hiroaki","first_name":"Hiroaki"}],"publication":"Physical Review B","intvolume":"       105","external_id":{"arxiv":["2101.08277"],"isi":["000800752500001"]},"oa_version":"Preprint","_id":"10863","status":"public","acknowledgement":"We are grateful to Takahiro Morimoto and Zhanybek Alpichshev for fruitful discussions. MD was supported by Austrian Agency for International Cooperation in Education and Research (OeAD-GmbH) and by the John Seo Fellowship at MIT. HI was supported by JSPS KAKENHI Grant Numbers JP19K14649 and JP18H03676, and by UTokyo Global Activity Support Program for\r\nYoung Researchers.","citation":{"chicago":"Davydova, Margarita, Maksym Serbyn, and Hiroaki Ishizuka. “Symmetry-Allowed Nonlinear Orbital Response across the Topological Phase Transition in Centrosymmetric Materials.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/PhysRevB.105.L121407\">https://doi.org/10.1103/PhysRevB.105.L121407</a>.","short":"M. Davydova, M. Serbyn, H. Ishizuka, Physical Review B 105 (2022).","mla":"Davydova, Margarita, et al. “Symmetry-Allowed Nonlinear Orbital Response across the Topological Phase Transition in Centrosymmetric Materials.” <i>Physical Review B</i>, vol. 105, L121407, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/PhysRevB.105.L121407\">10.1103/PhysRevB.105.L121407</a>.","ista":"Davydova M, Serbyn M, Ishizuka H. 2022. Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. Physical Review B. 105, L121407.","ama":"Davydova M, Serbyn M, Ishizuka H. Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. <i>Physical Review B</i>. 2022;105. doi:<a href=\"https://doi.org/10.1103/PhysRevB.105.L121407\">10.1103/PhysRevB.105.L121407</a>","apa":"Davydova, M., Serbyn, M., &#38; Ishizuka, H. (2022). Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.105.L121407\">https://doi.org/10.1103/PhysRevB.105.L121407</a>","ieee":"M. Davydova, M. Serbyn, and H. Ishizuka, “Symmetry-allowed nonlinear orbital response across the topological phase transition in centrosymmetric materials,” <i>Physical Review B</i>, vol. 105. American Physical Society, 2022."},"year":"2022","publisher":"American Physical Society","arxiv":1,"day":"17","isi":1,"fulldoi":"https://doi.org/10.1103/PhysRevB.105.L121407","article_type":"letter_note","date_published":"2022-03-17T00:00:00Z","date_updated":"2023-08-03T06:09:56Z","abstract":[{"text":"Nonlinear optical responses are commonly used as a probe for studying the electronic properties of materials. For topological materials, studies thus far focused on photogalvanic electric currents, which are forbidden in centrosymmetric materials because they require broken inversion symmetry. In this Letter, we propose a class of symmetry-allowed responses for inversion-symmetric topological insulators with two doubly degenerate bands. We consider a specific example of such a response, the orbital current, and show that the sign of the response reflects the Z2 topological index, i.e., the orbital current changes sign at the transition between trivial and topological insulator phases. This is illustrated in two models of topological insulators: the Bernevig-Hughes-Zhang model and the 1T′ phase of transition metal dichalcogenides.","lang":"eng"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8"},{"publication":"Physical Review B","author":[{"full_name":"De Nicola, Stefano","last_name":"De Nicola","id":"42832B76-F248-11E8-B48F-1D18A9856A87","first_name":"Stefano","orcid":"0000-0002-4842-6671"},{"first_name":"Alexios","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis"},{"full_name":"Serbyn, Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","first_name":"Maksym","orcid":"0000-0002-2399-5827"}],"corr_author":"1","scopus_import":"1","article_number":"165149","title":"Entanglement and precession in two-dimensional dynamical quantum phase transitions","oa":1,"publication_identifier":{"eisbn":["2469-9969"],"issn":["2469-9950"]},"type":"journal_article","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2112.11273"}],"doi":"10.1103/PhysRevB.105.165149","month":"04","publication_status":"published","volume":105,"department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"project":[{"grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E"},{"grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020"}],"quality_controlled":"1","article_processing_charge":"No","date_created":"2022-04-28T08:06:10Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","abstract":[{"text":"Nonanalytic points in the return probability of a quantum state as a function of time, known as dynamical quantum phase transitions (DQPTs), have received great attention in recent years, but the understanding of their mechanism is still incomplete. In our recent work [Phys. Rev. Lett. 126, 040602 (2021)], we demonstrated that one-dimensional DQPTs can be produced by two distinct mechanisms, namely semiclassical precession and entanglement generation, leading to the definition of precession (pDQPTs) and entanglement (eDQPTs) dynamical quantum phase transitions. In this manuscript, we extend and investigate the notion of p- and eDQPTs in two-dimensional systems by considering semi-infinite ladders of varying width. For square lattices, we find that pDQPTs and eDQPTs persist and are characterized by similar phenomenology as in 1D: pDQPTs are associated with a magnetization sign change and a wide entanglement gap, while eDQPTs correspond to suppressed local observables and avoided crossings in the entanglement spectrum. However, DQPTs show higher sensitivity to the ladder width and other details, challenging the extrapolation to the thermodynamic limit especially for eDQPTs. Moving to honeycomb lattices, we also demonstrate that lattices with an odd number of nearest neighbors give rise to phenomenologies beyond the one-dimensional classification.","lang":"eng"}],"ec_funded":1,"date_updated":"2025-04-14T07:43:57Z","date_published":"2022-04-15T00:00:00Z","fulldoi":"https://doi.org/10.1103/PhysRevB.105.165149","article_type":"original","isi":1,"day":"15","arxiv":1,"publisher":"American Physical Society","acknowledgement":"We acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899).\r\nS.D.N. also acknowledges funding from the Institute of Science and Technology (IST) Austria, and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411.","citation":{"chicago":"De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/PhysRevB.105.165149\">https://doi.org/10.1103/PhysRevB.105.165149</a>.","short":"S. De Nicola, A. Michailidis, M. Serbyn, Physical Review B 105 (2022).","mla":"De Nicola, Stefano, et al. “Entanglement and Precession in Two-Dimensional Dynamical Quantum Phase Transitions.” <i>Physical Review B</i>, vol. 105, 165149, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/PhysRevB.105.165149\">10.1103/PhysRevB.105.165149</a>.","ista":"De Nicola S, Michailidis A, Serbyn M. 2022. Entanglement and precession in two-dimensional dynamical quantum phase transitions. Physical Review B. 105, 165149.","ama":"De Nicola S, Michailidis A, Serbyn M. Entanglement and precession in two-dimensional dynamical quantum phase transitions. <i>Physical Review B</i>. 2022;105. doi:<a href=\"https://doi.org/10.1103/PhysRevB.105.165149\">10.1103/PhysRevB.105.165149</a>","apa":"De Nicola, S., Michailidis, A., &#38; Serbyn, M. (2022). Entanglement and precession in two-dimensional dynamical quantum phase transitions. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.105.165149\">https://doi.org/10.1103/PhysRevB.105.165149</a>","ieee":"S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement and precession in two-dimensional dynamical quantum phase transitions,” <i>Physical Review B</i>, vol. 105. American Physical Society, 2022."},"year":"2022","_id":"11337","status":"public","oa_version":"Preprint","external_id":{"arxiv":["2112.11273"],"isi":["000806812400004"]},"intvolume":"       105"},{"doi":"10.1021/acs.nanolett.2c00435","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2109.00556"}],"type":"journal_article","pmid":1,"publication_identifier":{"issn":["1530-6984"],"eissn":["1530-6992"]},"title":"Spontaneous gully-polarized quantum hall states in ABA trilayer graphene","oa":1,"scopus_import":"1","author":[{"last_name":"Winterer","full_name":"Winterer, Felix","first_name":"Felix"},{"last_name":"Seiler","full_name":"Seiler, Anna M.","first_name":"Anna M."},{"id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan","full_name":"Ghazaryan, Areg","first_name":"Areg","orcid":"0000-0001-9666-3543"},{"first_name":"Fabian R.","full_name":"Geisenhof, Fabian R.","last_name":"Geisenhof"},{"first_name":"Kenji","full_name":"Watanabe, Kenji","last_name":"Watanabe"},{"full_name":"Taniguchi, Takashi","last_name":"Taniguchi","first_name":"Takashi"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","first_name":"Maksym"},{"full_name":"Weitz, R. Thomas","last_name":"Weitz","first_name":"R. Thomas"}],"publication":"Nano Letters","date_created":"2022-05-15T22:01:41Z","article_processing_charge":"No","quality_controlled":"1","department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"volume":22,"publication_status":"published","page":"3317-3322","month":"04","fulldoi":"https://doi.org/10.1021/acs.nanolett.2c00435","article_type":"original","date_published":"2022-04-27T00:00:00Z","date_updated":"2025-06-11T13:47:08Z","abstract":[{"lang":"eng","text":"Bernal-stacked multilayer graphene is a versatile platform to explore quantum transport phenomena and interaction physics due to its exceptional tunability via electrostatic gating. For instance, upon applying a perpendicular electric field, its band structure exhibits several off-center Dirac points (so-called Dirac gullies) in each valley. Here, the formation of Dirac gullies and the interaction-induced breakdown of gully coherence is explored via magnetotransport measurements in high-quality Bernal-stacked (ABA) trilayer graphene. At zero magnetic field, multiple Lifshitz transitions indicating the formation of Dirac gullies are identified. In the quantum Hall regime, the emergence of Dirac gullies is evident as an increase in Landau level degeneracy. When tuning both electric and magnetic fields, electron–electron interactions can be controllably enhanced until, beyond critical electric and magnetic fields, the gully degeneracy is eventually lifted. The arising correlated ground state is consistent with a previously predicted nematic phase that spontaneously breaks the rotational gully symmetry."}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","intvolume":"        22","external_id":{"pmid":["35405074"],"arxiv":["2109.00556"],"isi":["000809056900019"]},"issue":"8","oa_version":"Preprint","_id":"11379","status":"public","year":"2022","acknowledgement":"We acknowledge funding from the Center for Nanoscience (CeNS) and by the Deutsche\r\nForschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy-EXC-2111-390814868 (MCQST). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant Number PMXP0112101001) and JSPS KAKENHI (Grant Numbers 19H05790 and JP20H00354).","citation":{"ieee":"F. Winterer <i>et al.</i>, “Spontaneous gully-polarized quantum hall states in ABA trilayer graphene,” <i>Nano Letters</i>, vol. 22, no. 8. American Chemical Society, pp. 3317–3322, 2022.","apa":"Winterer, F., Seiler, A. M., Ghazaryan, A., Geisenhof, F. R., Watanabe, K., Taniguchi, T., … Weitz, R. T. (2022). Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. <i>Nano Letters</i>. American Chemical Society. <a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">https://doi.org/10.1021/acs.nanolett.2c00435</a>","ista":"Winterer F, Seiler AM, Ghazaryan A, Geisenhof FR, Watanabe K, Taniguchi T, Serbyn M, Weitz RT. 2022. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. Nano Letters. 22(8), 3317–3322.","ama":"Winterer F, Seiler AM, Ghazaryan A, et al. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. <i>Nano Letters</i>. 2022;22(8):3317-3322. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">10.1021/acs.nanolett.2c00435</a>","mla":"Winterer, Felix, et al. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” <i>Nano Letters</i>, vol. 22, no. 8, American Chemical Society, 2022, pp. 3317–22, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">10.1021/acs.nanolett.2c00435</a>.","short":"F. Winterer, A.M. Seiler, A. Ghazaryan, F.R. Geisenhof, K. Watanabe, T. Taniguchi, M. Serbyn, R.T. Weitz, Nano Letters 22 (2022) 3317–3322.","chicago":"Winterer, Felix, Anna M. Seiler, Areg Ghazaryan, Fabian R. Geisenhof, Kenji Watanabe, Takashi Taniguchi, Maksym Serbyn, and R. Thomas Weitz. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” <i>Nano Letters</i>. American Chemical Society, 2022. <a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">https://doi.org/10.1021/acs.nanolett.2c00435</a>."},"publisher":"American Chemical Society","day":"27","arxiv":1,"isi":1},{"date_updated":"2026-04-07T13:26:31Z","ec_funded":1,"abstract":[{"text":"Thermalizing and localized many-body quantum systems present two distinct dynamical phases of matter. Recently the fate of a localized system coupled to a thermalizing system viewed as a quantum bath received significant theoretical and experimental attention. In this work, we study a mobile impurity, representing a small quantum bath, that interacts locally with an Anderson insulator with a finite density of localized particles. Using static Hartree approximation to obtain an effective disorder strength, we formulate an analytic criterion for the perturbative stability of the localization. Next, we use an approximate dynamical Hartree method and the quasi-exact time-evolved block decimation (TEBD) algorithm to study the dynamics of the system. We find that the dynamical Hartree approach which completely ignores entanglement between the impurity and localized particles predicts the delocalization of the system. In contrast, the full numerical simulation of the unitary dynamics with TEBD suggests the stability of localization on numerically accessible timescales. Finally, using an extension of the density matrix renormalization group algorithm to excited states (DMRG-X), we approximate the highly excited eigenstates of the system. We find that the impurity remains localized in the eigenstates and entanglement is enhanced in a finite region around the position of the impurity, confirming the dynamical predictions. Dynamics and the DMRG-X results provide compelling evidence for the stability of localization.","lang":"eng"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_type":"original","fulldoi":"https://doi.org/10.1103/physrevb.105.224208","date_published":"2022-06-27T00:00:00Z","oa_version":"Preprint","_id":"11469","status":"public","publisher":"American Physical Society","acknowledgement":"We thank M. Ljubotina for insightful discussions. P. B., A. M. and M. S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D. A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva.","citation":{"chicago":"Brighi, Pietro, Alexios Michailidis, Kristina Kirova, Dmitry A. Abanin, and Maksym Serbyn. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.105.224208\">https://doi.org/10.1103/physrevb.105.224208</a>.","short":"P. Brighi, A. Michailidis, K. Kirova, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022).","mla":"Brighi, Pietro, et al. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” <i>Physical Review B</i>, vol. 105, no. 22, 224208, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.105.224208\">10.1103/physrevb.105.224208</a>.","ista":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. 2022. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 105(22), 224208.","ama":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. Localization of a mobile impurity interacting with an Anderson insulator. <i>Physical Review B</i>. 2022;105(22). doi:<a href=\"https://doi.org/10.1103/physrevb.105.224208\">10.1103/physrevb.105.224208</a>","apa":"Brighi, P., Michailidis, A., Kirova, K., Abanin, D. A., &#38; Serbyn, M. (2022). Localization of a mobile impurity interacting with an Anderson insulator. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.105.224208\">https://doi.org/10.1103/physrevb.105.224208</a>","ieee":"P. Brighi, A. Michailidis, K. Kirova, D. A. Abanin, and M. Serbyn, “Localization of a mobile impurity interacting with an Anderson insulator,” <i>Physical Review B</i>, vol. 105, no. 22. American Physical Society, 2022."},"year":"2022","isi":1,"day":"27","arxiv":1,"acknowledged_ssus":[{"_id":"ScienComp"}],"intvolume":"       105","issue":"22","external_id":{"isi":["000823050000001"],"arxiv":["2111.08603"]},"scopus_import":"1","corr_author":"1","author":[{"last_name":"Brighi","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","first_name":"Pietro"},{"first_name":"Alexios","orcid":"0000-0002-8443-1064","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","last_name":"Michailidis","full_name":"Michailidis, Alexios"},{"full_name":"Kirova, Kristina","id":"4aeda2ae-f847-11ec-98e0-c4a66fe174d4","last_name":"Kirova","first_name":"Kristina"},{"full_name":"Abanin, Dmitry A.","last_name":"Abanin","first_name":"Dmitry A."},{"orcid":"0000-0002-2399-5827","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym"}],"publication":"Physical Review B","type":"journal_article","doi":"10.1103/physrevb.105.224208","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2111.08603"}],"title":"Localization of a mobile impurity interacting with an Anderson insulator","oa":1,"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"article_number":"224208","publication_status":"published","department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"volume":105,"month":"06","article_processing_charge":"No","date_created":"2022-06-29T20:19:51Z","related_material":{"record":[{"relation":"dissertation_contains","id":"12732","status":"public"}]},"quality_controlled":"1","project":[{"grant_number":"850899","call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}]},{"article_number":"L220203","doi":"10.1103/physrevb.105.l220203","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2109.07332"}],"type":"journal_article","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"oa":1,"title":"Propagation of many-body localization in an Anderson insulator","author":[{"orcid":"0000-0002-7969-2729","first_name":"Pietro","last_name":"Brighi","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","full_name":"Brighi, Pietro"},{"last_name":"Michailidis","full_name":"Michailidis, Alexios A.","first_name":"Alexios A."},{"first_name":"Dmitry A.","last_name":"Abanin","full_name":"Abanin, Dmitry A."},{"last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","first_name":"Maksym","orcid":"0000-0002-2399-5827"}],"publication":"Physical Review B","scopus_import":"1","corr_author":"1","related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"12732"}]},"quality_controlled":"1","project":[{"grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020"}],"date_created":"2022-06-29T20:20:47Z","article_processing_charge":"No","month":"06","volume":105,"department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"publication_status":"published","fulldoi":"https://doi.org/10.1103/physrevb.105.l220203","article_type":"original","date_published":"2022-06-27T00:00:00Z","ec_funded":1,"abstract":[{"text":"Many-body localization (MBL) is an example of a dynamical phase of matter that avoids thermalization. While the MBL phase is robust to weak local perturbations, the fate of an MBL system coupled to a thermalizing quantum system that represents a “heat bath” is an open question that is actively investigated theoretically and experimentally. In this work, we consider the stability of an Anderson insulator with a finite density of particles interacting with a single mobile impurity—a small quantum bath. We give perturbative arguments that support the stability of localization in the strong interaction regime. Large-scale tensor network simulations of dynamics are employed to corroborate the presence of the localized phase and give quantitative predictions in the thermodynamic limit. We develop a phenomenological description of the dynamics in the strong interaction regime, and we demonstrate that the impurity effectively turns the Anderson insulator into an MBL phase, giving rise to nontrivial entanglement dynamics well captured by our phenomenology.","lang":"eng"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","date_updated":"2026-04-07T13:26:31Z","intvolume":"       105","external_id":{"isi":["000823050000012"],"arxiv":["2109.07332"]},"issue":"22","acknowledged_ssus":[{"_id":"ScienComp"}],"year":"2022","citation":{"apa":"Brighi, P., Michailidis, A. A., Abanin, D. A., &#38; Serbyn, M. (2022). Propagation of many-body localization in an Anderson insulator. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.105.l220203\">https://doi.org/10.1103/physrevb.105.l220203</a>","ieee":"P. Brighi, A. A. Michailidis, D. A. Abanin, and M. Serbyn, “Propagation of many-body localization in an Anderson insulator,” <i>Physical Review B</i>, vol. 105, no. 22. American Physical Society, 2022.","ama":"Brighi P, Michailidis AA, Abanin DA, Serbyn M. Propagation of many-body localization in an Anderson insulator. <i>Physical Review B</i>. 2022;105(22). doi:<a href=\"https://doi.org/10.1103/physrevb.105.l220203\">10.1103/physrevb.105.l220203</a>","ista":"Brighi P, Michailidis AA, Abanin DA, Serbyn M. 2022. Propagation of many-body localization in an Anderson insulator. Physical Review B. 105(22), L220203.","mla":"Brighi, Pietro, et al. “Propagation of Many-Body Localization in an Anderson Insulator.” <i>Physical Review B</i>, vol. 105, no. 22, L220203, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.105.l220203\">10.1103/physrevb.105.l220203</a>.","short":"P. Brighi, A.A. Michailidis, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022).","chicago":"Brighi, Pietro, Alexios A. Michailidis, Dmitry A. Abanin, and Maksym Serbyn. “Propagation of Many-Body Localization in an Anderson Insulator.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.105.l220203\">https://doi.org/10.1103/physrevb.105.l220203</a>."},"acknowledgement":"We acknowledge useful discussions with M. Ljubotina. P. B., A. M., and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva.","publisher":"American Physical Society","arxiv":1,"day":"27","isi":1,"oa_version":"Preprint","status":"public","_id":"11470"},{"intvolume":"         4","file":[{"date_updated":"2023-01-20T12:03:31Z","content_type":"application/pdf","creator":"dernst","relation":"main_file","access_level":"open_access","checksum":"556820cf6e4af77c8476e5b8f4114d1a","file_name":"2022_PhysicalReviewResearch_Stocker.pdf","date_created":"2023-01-20T12:03:31Z","file_size":2941167,"file_id":"12328","success":1}],"issue":"4","publisher":"American Physical Society","citation":{"ama":"Stocker L, Sack S, Ferguson MS, Zilberberg O. Entanglement-based observables for quantum impurities. <i>Physical Review Research</i>. 2022;4(4). doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">10.1103/PhysRevResearch.4.043177</a>","ista":"Stocker L, Sack S, Ferguson MS, Zilberberg O. 2022. Entanglement-based observables for quantum impurities. Physical Review Research. 4(4), 043177.","ieee":"L. Stocker, S. Sack, M. S. Ferguson, and O. Zilberberg, “Entanglement-based observables for quantum impurities,” <i>Physical Review Research</i>, vol. 4, no. 4. American Physical Society, 2022.","apa":"Stocker, L., Sack, S., Ferguson, M. S., &#38; Zilberberg, O. (2022). Entanglement-based observables for quantum impurities. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">https://doi.org/10.1103/PhysRevResearch.4.043177</a>","chicago":"Stocker, Lidia, Stefan Sack, Michael S. Ferguson, and Oded Zilberberg. “Entanglement-Based Observables for Quantum Impurities.” <i>Physical Review Research</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">https://doi.org/10.1103/PhysRevResearch.4.043177</a>.","short":"L. Stocker, S. Sack, M.S. Ferguson, O. Zilberberg, Physical Review Research 4 (2022).","mla":"Stocker, Lidia, et al. “Entanglement-Based Observables for Quantum Impurities.” <i>Physical Review Research</i>, vol. 4, no. 4, 043177, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">10.1103/PhysRevResearch.4.043177</a>."},"acknowledgement":"We thank G. Blatter, T. Ihn, K. Ensslin, M. Goldstein, C. Carisch, and J. del Pino for illuminating discussions and acknowledge financial support from the Swiss National Science Foundation (SNSF) through Project No. 190078, and from the Deutsche Forschungsgemeinschaft (DFG) - Project No. 449653034. Our numerical implementations are based on the ITensors JULIA library [64].","year":"2022","day":"01","oa_version":"Published Version","status":"public","_id":"12111","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"article_type":"original","fulldoi":"https://doi.org/10.1103/PhysRevResearch.4.043177","date_published":"2022-12-01T00:00:00Z","has_accepted_license":"1","ddc":["530"],"abstract":[{"text":"Quantum impurities exhibit fascinating many-body phenomena when the small interacting impurity changes the physics of a large noninteracting environment. The characterisation of such strongly correlated nonperturbative effects is particularly challenging due to the infinite size of the environment, and the inability of local correlators to capture the buildup of long-ranged entanglement in the system. Here, we harness an entanglement-based observable—the purity of the impurity—as a witness for the formation of strong correlations. We showcase the utility of our scheme by exactly solving the open Kondo box model in the small box limit, and thus describe all-electronic dot-cavity devices. Specifically, we conclusively characterize the metal-to-insulator phase transition in the system and identify how the (conducting) dot-lead Kondo singlet is quenched by an (insulating) intraimpurity singlet formation. Furthermore, we propose an experimentally feasible tomography protocol for the measurement of the purity, which motivates the observation of impurity physics through their entanglement build up.","lang":"eng"}],"file_date_updated":"2023-01-20T12:03:31Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2023-02-13T09:08:28Z","quality_controlled":"1","article_processing_charge":"No","date_created":"2023-01-08T23:00:53Z","month":"12","publication_status":"published","volume":4,"language":[{"iso":"eng"}],"department":[{"_id":"MaSe"}],"article_number":"043177","type":"journal_article","doi":"10.1103/PhysRevResearch.4.043177","oa":1,"title":"Entanglement-based observables for quantum impurities","publication_identifier":{"issn":["2643-1564"]},"author":[{"last_name":"Stocker","full_name":"Stocker, Lidia","first_name":"Lidia"},{"first_name":"Stefan","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","last_name":"Sack","full_name":"Sack, Stefan"},{"first_name":"Michael S.","last_name":"Ferguson","full_name":"Ferguson, Michael S."},{"first_name":"Oded","full_name":"Zilberberg, Oded","last_name":"Zilberberg"}],"publication":"Physical Review Research","scopus_import":"1"},{"external_id":{"pmid":["36182399"],"arxiv":["2206.01531"],"isi":["000861009600005"]},"issue":"9","file":[{"success":1,"file_id":"12445","date_created":"2023-01-30T09:41:12Z","file_size":3209644,"file_name":"2022_Chaos_Choueiri.pdf","access_level":"open_access","checksum":"17881eff8b21969359a2dd64620120ba","relation":"main_file","creator":"dernst","date_updated":"2023-01-30T09:41:12Z","content_type":"application/pdf"}],"intvolume":"        32","_id":"12259","status":"public","oa_version":"Published Version","day":"26","arxiv":1,"isi":1,"citation":{"ista":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary Journal of Nonlinear Science. 32(9), 093138.","ama":"Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. 2022;32(9). doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>","apa":"Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., &#38; Budanur, N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments. <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>","ieee":"G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur, “Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9. AIP Publishing, 2022.","chicago":"Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>. AIP Publishing, 2022. <a href=\"https://doi.org/10.1063/5.0102904\">https://doi.org/10.1063/5.0102904</a>.","short":"G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos: An Interdisciplinary Journal of Nonlinear Science 32 (2022).","mla":"Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave Experiments.” <i>Chaos: An Interdisciplinary Journal of Nonlinear Science</i>, vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:<a href=\"https://doi.org/10.1063/5.0102904\">10.1063/5.0102904</a>."},"year":"2022","acknowledgement":"This work was partially funded by the Institute of Science and Technology Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos and Quantum Analogies.”","publisher":"AIP Publishing","ddc":["530"],"has_accepted_license":"1","date_published":"2022-09-26T00:00:00Z","article_type":"original","fulldoi":"https://doi.org/10.1063/5.0102904","keyword":["Applied Mathematics","General Physics and Astronomy","Mathematical Physics","Statistical and Nonlinear Physics"],"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"date_updated":"2025-06-11T13:41:34Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","abstract":[{"text":"Theoretical foundations of chaos have been predominantly laid out for finite-dimensional dynamical systems, such as the three-body problem in classical mechanics and the Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena, e.g., weather, arise in systems with many (formally infinite) degrees of freedom, which limits direct quantitative analysis of such systems using chaos theory. In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer a bridge between low- and high-dimensional chaotic phenomena by allowing for a systematic study of how the former connects to the latter. Specifically, we present experimental results, which show the formation of low-dimensional chaotic attractors upon destabilization of regular dynamics and a final transition to high-dimensional chaos via the merging of distinct chaotic regions through a crisis bifurcation. Moreover, we show that the post-crisis dynamics of the system can be rationalized as consecutive scatterings from the nonattracting chaotic sets with lifetimes following exponential distributions. ","lang":"eng"}],"file_date_updated":"2023-01-30T09:41:12Z","date_created":"2023-01-16T09:58:16Z","article_processing_charge":"No","quality_controlled":"1","department":[{"_id":"MaSe"},{"_id":"BjHo"},{"_id":"NanoFab"}],"language":[{"iso":"eng"}],"volume":32,"publication_status":"published","month":"09","pmid":1,"publication_identifier":{"issn":["1054-1500"],"eissn":["1089-7682"]},"title":"Crises and chaotic scattering in hydrodynamic pilot-wave experiments","oa":1,"doi":"10.1063/5.0102904","type":"journal_article","article_number":"093138","scopus_import":"1","publication":"Chaos: An Interdisciplinary Journal of Nonlinear Science","author":[{"full_name":"Choueiri, George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87","last_name":"Choueiri","first_name":"George H"},{"full_name":"Suri, Balachandra","last_name":"Suri","id":"47A5E706-F248-11E8-B48F-1D18A9856A87","first_name":"Balachandra"},{"first_name":"Jack","orcid":"0000-0001-5145-4609","full_name":"Merrin, Jack","last_name":"Merrin","id":"4515C308-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym"},{"first_name":"Björn","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","last_name":"Hof","id":"3A374330-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Budanur, Nazmi B","id":"3EA1010E-F248-11E8-B48F-1D18A9856A87","last_name":"Budanur","orcid":"0000-0003-0423-5010","first_name":"Nazmi B"}]},{"date_updated":"2025-04-14T07:52:06Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","ec_funded":1,"abstract":[{"lang":"eng","text":"We study the thermalization of a small XX chain coupled to long, gapped XXZ leads at either side by observing the relaxation dynamics of the whole system. Using extensive tensor network simulations, we show that such systems, although not integrable, appear to show either extremely slow thermalization or even lack thereof since the two cannot be distinguished within the accuracy of our numerics. We show that the persistent oscillations observed in the spin current in the middle of the XX chain are related to eigenstates of the entire system located within the gap of the boundary chains. We find from exact diagonalization that some of these states remain strictly localized within the XX chain and do not hybridize with the rest of the system. The frequencies of the persistent oscillations determined by numerical simulations of dynamics match the energy differences between these states exactly. This has important implications for open systems, where the strongly interacting leads are often assumed to thermalize the central system. Our results suggest that, if we employ gapped systems for the leads, this assumption does not hold."}],"date_published":"2022-08-31T00:00:00Z","article_type":"original","fulldoi":"https://doi.org/10.1103/physrevb.106.054314","_id":"12269","status":"public","oa_version":"Preprint","arxiv":1,"day":"31","isi":1,"acknowledgement":"M.L. and T.P. acknowledge support from the European Research Council (ERC) through the advanced grant 694544 – OMNES and the grant P1-0402 of Slovenian Research Agency (ARRS). M.L. acknowledges support from the European Research Council (ERC) through the starting grant 850899 – NEQuM. D.R. acknowledges support from the Ministry of Electronics & Information Technology (MeitY), India under the grant for “Centre for Excellence in Quantum\r\nTechnologies” with Ref. No. 4(7)/2020-ITEA. ","year":"2022","citation":{"ista":"Ljubotina M, Roy D, Prosen T. 2022. Absence of thermalization of free systems coupled to gapped interacting reservoirs. Physical Review B. 106(5), 054314.","ama":"Ljubotina M, Roy D, Prosen T. Absence of thermalization of free systems coupled to gapped interacting reservoirs. <i>Physical Review B</i>. 2022;106(5). doi:<a href=\"https://doi.org/10.1103/physrevb.106.054314\">10.1103/physrevb.106.054314</a>","ieee":"M. Ljubotina, D. Roy, and T. Prosen, “Absence of thermalization of free systems coupled to gapped interacting reservoirs,” <i>Physical Review B</i>, vol. 106, no. 5. American Physical Society, 2022.","apa":"Ljubotina, M., Roy, D., &#38; Prosen, T. (2022). Absence of thermalization of free systems coupled to gapped interacting reservoirs. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.106.054314\">https://doi.org/10.1103/physrevb.106.054314</a>","chicago":"Ljubotina, Marko, Dibyendu Roy, and Tomaž Prosen. “Absence of Thermalization of Free Systems Coupled to Gapped Interacting Reservoirs.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.106.054314\">https://doi.org/10.1103/physrevb.106.054314</a>.","short":"M. Ljubotina, D. Roy, T. Prosen, Physical Review B 106 (2022).","mla":"Ljubotina, Marko, et al. “Absence of Thermalization of Free Systems Coupled to Gapped Interacting Reservoirs.” <i>Physical Review B</i>, vol. 106, no. 5, 054314, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.106.054314\">10.1103/physrevb.106.054314</a>."},"publisher":"American Physical Society","external_id":{"isi":["000861332900005"],"arxiv":["2106.08373"]},"issue":"5","intvolume":"       106","scopus_import":"1","publication":"Physical Review B","author":[{"orcid":"0000-0003-0038-7068","first_name":"Marko","full_name":"Ljubotina, Marko","last_name":"Ljubotina","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"full_name":"Roy, Dibyendu","last_name":"Roy","first_name":"Dibyendu"},{"last_name":"Prosen","full_name":"Prosen, Tomaž","first_name":"Tomaž"}],"publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"oa":1,"title":"Absence of thermalization of free systems coupled to gapped interacting reservoirs","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2106.08373"}],"doi":"10.1103/physrevb.106.054314","type":"journal_article","article_number":"054314","department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"volume":106,"publication_status":"published","month":"08","date_created":"2023-01-16T10:00:39Z","article_processing_charge":"No","project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899"}],"quality_controlled":"1"},{"file":[{"file_size":7661905,"date_created":"2023-01-30T11:02:50Z","file_name":"2022_PRXQuantum_Ljubotina.pdf","success":1,"file_id":"12457","creator":"dernst","date_updated":"2023-01-30T11:02:50Z","content_type":"application/pdf","access_level":"open_access","checksum":"ef8f0a1b5a019b3958009162de0fa4c3","relation":"main_file"}],"intvolume":"         3","external_id":{"arxiv":["2204.02899"]},"issue":"3","year":"2022","acknowledgement":"We thank A. A. Michailidis for insightful discussions. M.L. and M.S. acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 850899). D.A. is supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No. 864597) and by the Swiss National Science Foundation. The infinite TEBD simulations were performed using the ITensor library [67].","citation":{"chicago":"Ljubotina, Marko, Barbara Roos, Dmitry A. Abanin, and Maksym Serbyn. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” <i>PRX Quantum</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/prxquantum.3.030343\">https://doi.org/10.1103/prxquantum.3.030343</a>.","short":"M. Ljubotina, B. Roos, D.A. Abanin, M. Serbyn, PRX Quantum 3 (2022).","mla":"Ljubotina, Marko, et al. “Optimal Steering of Matrix Product States and Quantum Many-Body Scars.” <i>PRX Quantum</i>, vol. 3, no. 3, 030343, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/prxquantum.3.030343\">10.1103/prxquantum.3.030343</a>.","ista":"Ljubotina M, Roos B, Abanin DA, Serbyn M. 2022. Optimal steering of matrix product states and quantum many-body scars. PRX Quantum. 3(3), 030343.","ama":"Ljubotina M, Roos B, Abanin DA, Serbyn M. Optimal steering of matrix product states and quantum many-body scars. <i>PRX Quantum</i>. 2022;3(3). doi:<a href=\"https://doi.org/10.1103/prxquantum.3.030343\">10.1103/prxquantum.3.030343</a>","ieee":"M. Ljubotina, B. Roos, D. A. Abanin, and M. Serbyn, “Optimal steering of matrix product states and quantum many-body scars,” <i>PRX Quantum</i>, vol. 3, no. 3. American Physical Society, 2022.","apa":"Ljubotina, M., Roos, B., Abanin, D. A., &#38; Serbyn, M. (2022). Optimal steering of matrix product states and quantum many-body scars. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.3.030343\">https://doi.org/10.1103/prxquantum.3.030343</a>"},"publisher":"American Physical Society","day":"23","arxiv":1,"oa_version":"Published Version","_id":"12276","status":"public","article_type":"original","fulldoi":"https://doi.org/10.1103/prxquantum.3.030343","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"keyword":["General Medicine"],"ddc":["530"],"has_accepted_license":"1","date_published":"2022-09-23T00:00:00Z","abstract":[{"text":"Ongoing development of quantum simulators allows for a progressively finer degree of control of quantum many-body systems. This motivates the development of efficient approaches to facilitate the control of such systems and enable the preparation of nontrivial quantum states. Here we formulate an approach to control quantum systems based on matrix product states (MPSs). We compare counterdiabatic and leakage minimization approaches to the so-called local steering problem that consists in finding the best value of the control parameters for generating a unitary evolution of the specific MPS in a given direction. In order to benchmark the different approaches, we apply them to the generalization of the PXP model known to exhibit coherent quantum dynamics due to quantum many-body scars. We find that the leakage-based approach generally outperforms the counterdiabatic framework and use it to construct a Floquet model with quantum scars. We perform the first steps towards global trajectory optimization and demonstrate entanglement steering capabilities in the generalized PXP model. Finally, we apply our leakage minimization approach to construct quantum scars in the periodically driven nonintegrable Ising model.","lang":"eng"}],"file_date_updated":"2023-01-30T11:02:50Z","ec_funded":1,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2025-04-14T07:52:07Z","quality_controlled":"1","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","grant_number":"850899"}],"date_created":"2023-01-16T10:01:56Z","article_processing_charge":"No","month":"09","department":[{"_id":"MaSe"},{"_id":"RoSe"}],"language":[{"iso":"eng"}],"volume":3,"publication_status":"published","article_number":"030343","doi":"10.1103/prxquantum.3.030343","type":"journal_article","publication_identifier":{"eissn":["2691-3399"]},"oa":1,"title":"Optimal steering of matrix product states and quantum many-body scars","author":[{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","last_name":"Ljubotina","full_name":"Ljubotina, Marko","orcid":"0000-0003-0038-7068","first_name":"Marko"},{"orcid":"0000-0002-9071-5880","first_name":"Barbara","last_name":"Roos","id":"5DA90512-D80F-11E9-8994-2E2EE6697425","full_name":"Roos, Barbara"},{"first_name":"Dmitry A.","full_name":"Abanin, Dmitry A.","last_name":"Abanin"},{"full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","first_name":"Maksym"}],"publication":"PRX Quantum","scopus_import":"1","corr_author":"1"},{"article_processing_charge":"No","date_created":"2023-03-23T14:33:13Z","related_material":{"record":[{"status":"public","id":"14334","relation":"later_version"},{"relation":"dissertation_contains","id":"12732","status":"public"}]},"publication_status":"draft","language":[{"iso":"eng"}],"department":[{"_id":"GradSch"},{"_id":"MaSe"}],"month":"11","oa":1,"title":"Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models","type":"preprint","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2210.15607"}],"doi":"10.48550/arXiv.2210.15607","article_number":"2210.15607","corr_author":"1","publication":"arXiv","author":[{"id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","last_name":"Brighi","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","first_name":"Pietro"},{"orcid":"0000-0003-0038-7068","first_name":"Marko","full_name":"Ljubotina, Marko","last_name":"Ljubotina","id":"F75EE9BE-5C90-11EA-905D-16643DDC885E"},{"first_name":"Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"external_id":{"arxiv":["2210.15607"]},"status":"public","_id":"12750","oa_version":"Preprint","arxiv":1,"day":"07","year":"2022","citation":{"ama":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>arXiv</i>. doi:<a href=\"https://doi.org/10.48550/arXiv.2210.15607\">10.48550/arXiv.2210.15607</a>","ista":"Brighi P, Ljubotina M, Serbyn M. Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. arXiv, 2210.15607.","apa":"Brighi, P., Ljubotina, M., &#38; Serbyn, M. (n.d.). Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models. <i>arXiv</i>. <a href=\"https://doi.org/10.48550/arXiv.2210.15607\">https://doi.org/10.48550/arXiv.2210.15607</a>","ieee":"P. Brighi, M. Ljubotina, and M. Serbyn, “Hilbert space fragmentation and slow dynamics in particle-conserving quantum East models,” <i>arXiv</i>. .","chicago":"Brighi, Pietro, Marko Ljubotina, and Maksym Serbyn. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>ArXiv</i>, n.d. <a href=\"https://doi.org/10.48550/arXiv.2210.15607\">https://doi.org/10.48550/arXiv.2210.15607</a>.","short":"P. Brighi, M. Ljubotina, M. Serbyn, ArXiv (n.d.).","mla":"Brighi, Pietro, et al. “Hilbert Space Fragmentation and Slow Dynamics in Particle-Conserving Quantum East Models.” <i>ArXiv</i>, 2210.15607, doi:<a href=\"https://doi.org/10.48550/arXiv.2210.15607\">10.48550/arXiv.2210.15607</a>."},"date_published":"2022-11-07T00:00:00Z","tmp":{"name":"Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","short":"CC BY-NC-SA (4.0)","legal_code_url":"https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode","image":"/images/cc_by_nc_sa.png"},"fulldoi":"https://doi.org/10.48550/arXiv.2210.15607","OA_place":"repository","date_updated":"2026-04-07T13:26:31Z","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","abstract":[{"text":"Quantum kinetically constrained models have recently attracted significant attention due to their anomalous dynamics and thermalization. In this work, we introduce a hitherto unexplored family of kinetically constrained models featuring a conserved particle number and strong inversion-symmetry breaking due to facilitated hopping. We demonstrate that these models provide a generic example of so-called quantum Hilbert space fragmentation, that is manifested in disconnected sectors in the Hilbert space that are not apparent in the computational basis. Quantum Hilbert space fragmentation leads to an exponential in system size number of eigenstates with exactly zero entanglement entropy across several bipartite cuts. These eigenstates can be probed dynamically using quenches from simple initial product states. In addition, we study the particle spreading under unitary dynamics launched from the domain wall state, and find faster than diffusive dynamics at high particle densities, that crosses over into logarithmically slow relaxation at smaller densities. Using a classically simulable cellular automaton, we reproduce the logarithmic dynamics observed in the quantum case. Our work suggests that particle conserving constrained models with inversion symmetry breaking realize so far unexplored universality classes of dynamics and invite their further theoretical and experimental studies.","lang":"eng"}]},{"author":[{"full_name":"Daguerre, L.","last_name":"Daguerre","first_name":"L."},{"last_name":"Torroba","full_name":"Torroba, G.","first_name":"G."},{"orcid":"0000-0002-5383-2869","first_name":"Raimel A","full_name":"Medina Ramos, Raimel A","last_name":"Medina Ramos","id":"CE680B90-D85A-11E9-B684-C920E6697425"},{"first_name":"M.","last_name":"Solís","full_name":"Solís, M."}],"publication":"Anales de la Asociacion Fisica Argentina","scopus_import":"1","type":"journal_article","doi":"10.31527/analesafa.2021.32.4.93","title":"Non relativistic quantum field theory: Dynamics and irreversibility","oa":1,"publication_identifier":{"eissn":["1850-1168"]},"month":"01","publication_status":"published","volume":32,"department":[{"_id":"MaSe"}],"language":[{"iso":"spa"}],"page":"93-98","quality_controlled":"1","article_processing_charge":"No","date_created":"2022-02-20T23:01:32Z","file_date_updated":"2022-02-21T09:32:44Z","abstract":[{"text":"studiamos aspectos de Teoría Cuántica de Campos a densidad finita usando técnicas y conceptos de información cuántica. Nos enfocamos en fermiones de Dirac masivos con potencial químico en 1+1 dimensiones espacio-temporales. Usando la entropía de entrelazamiento en un intervalo, construimos la función c entrópica que es finita. Esta función c no es monótona, e incorpora el entrelazamiento de largo alcance proveniente de la superficie de Fermi. Motivados por trabajos previos de modelos en la red, calculamos numéricamente las entropías de Renyi y encontramos oscilaciones de Friedel. Seguidamente, analizamos la información mutua como una medida de correlación entre diferentes regiones. Usando una expansión de distancia grande desarrollada por Cardy, argumentamos que la información mutua detecta las correlaciones inducidas por la superficie de Fermi todavía al orden dominante en la expansión. Finalmente, analizamos la entropía relativa y sus generalizaciones de Renyi para distinguir estados con diferente carga. Encontramos que estados en diferentes sectores de superselección dan origen a un comportamiento super-extensivo en la entropía relativa.","lang":"eng"}],"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","date_updated":"2026-04-02T12:30:12Z","DOAJ_listed":"1","OA_place":"publisher","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"fulldoi":"https://doi.org/10.31527/analesafa.2021.32.4.93","article_type":"original","date_published":"2022-01-13T00:00:00Z","has_accepted_license":"1","OA_type":"gold","ddc":["530"],"publisher":"Asociación Física Argentina","citation":{"ama":"Daguerre L, Torroba G, Medina Ramos RA, Solís M. Non relativistic quantum field theory: Dynamics and irreversibility. <i>Anales de la Asociacion Fisica Argentina</i>. 2022;32(4):93-98. doi:<a href=\"https://doi.org/10.31527/analesafa.2021.32.4.93\">10.31527/analesafa.2021.32.4.93</a>","ista":"Daguerre L, Torroba G, Medina Ramos RA, Solís M. 2022. Non relativistic quantum field theory: Dynamics and irreversibility. Anales de la Asociacion Fisica Argentina. 32(4), 93–98.","apa":"Daguerre, L., Torroba, G., Medina Ramos, R. A., &#38; Solís, M. (2022). Non relativistic quantum field theory: Dynamics and irreversibility. <i>Anales de la Asociacion Fisica Argentina</i>. Asociación Física Argentina. <a href=\"https://doi.org/10.31527/analesafa.2021.32.4.93\">https://doi.org/10.31527/analesafa.2021.32.4.93</a>","ieee":"L. Daguerre, G. Torroba, R. A. Medina Ramos, and M. Solís, “Non relativistic quantum field theory: Dynamics and irreversibility,” <i>Anales de la Asociacion Fisica Argentina</i>, vol. 32, no. 4. Asociación Física Argentina, pp. 93–98, 2022.","chicago":"Daguerre, L., G. Torroba, Raimel A Medina Ramos, and M. Solís. “Non relativistic quantum field theory: Dynamics and irreversibility.” <i>Anales de la Asociacion Fisica Argentina</i>. Asociación Física Argentina, 2022. <a href=\"https://doi.org/10.31527/analesafa.2021.32.4.93\">https://doi.org/10.31527/analesafa.2021.32.4.93</a>.","mla":"Daguerre, L., et al. “Non relativistic quantum field theory: Dynamics and irreversibility.” <i>Anales de la Asociacion Fisica Argentina</i>, vol. 32, no. 4, Asociación Física Argentina, 2022, pp. 93–98, doi:<a href=\"https://doi.org/10.31527/analesafa.2021.32.4.93\">10.31527/analesafa.2021.32.4.93</a>.","short":"L. Daguerre, G. Torroba, R.A. Medina Ramos, M. Solís, Anales de la Asociacion Fisica Argentina 32 (2022) 93–98."},"year":"2022","acknowledgement":"Se agradece a Horacio Casini por distintas discusiones y comentarios a lo largo del trabajo. LD cuenta con el apoyo de CNEA y UNCuyo, Inst. GT cuenta con el apoyo de CONICET,\r\nANPCyT, CNEA, y UNCuyo, Inst. Balseiro. RM cuenta con el apoyo de IST Austria. MS cuenta con el apoyode CONICET y UNCuyo, Inst. Balseiro. También se agradece a la Asociación Argentina de Física por la posibilidad de presentar este artículo en el marco de una Mención Especial por el Premio Luis Másperi 2020.","day":"13","oa_version":"Published Version","_id":"10769","status":"public","intvolume":"        32","file":[{"relation":"main_file","checksum":"ca66a3017205677c5b4d22b3bb74fb0b","access_level":"open_access","creator":"dernst","date_updated":"2022-02-21T09:32:44Z","content_type":"application/pdf","file_id":"10782","success":1,"file_size":4505751,"date_created":"2022-02-21T09:32:44Z","file_name":"2022_AnalesAFA_Daguerre.pdf"}],"issue":"4"},{"department":[{"_id":"MaSe"}],"language":[{"iso":"eng"}],"volume":3,"publication_status":"published","month":"06","date_created":"2022-06-29T20:21:32Z","article_processing_charge":"No","related_material":{"record":[{"status":"public","id":"17208","relation":"dissertation_contains"},{"id":"14622","relation":"dissertation_contains","status":"public"}]},"quality_controlled":"1","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","grant_number":"850899"}],"scopus_import":"1","corr_author":"1","author":[{"orcid":"0000-0001-5400-8508","first_name":"Stefan","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","last_name":"Sack","full_name":"Sack, Stefan"},{"first_name":"Raimel A","orcid":"0000-0002-5383-2869","full_name":"Medina Ramos, Raimel A","id":"CE680B90-D85A-11E9-B684-C920E6697425","last_name":"Medina Ramos"},{"orcid":"0000-0002-8443-1064","first_name":"Alexios","full_name":"Michailidis, Alexios","last_name":"Michailidis","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87"},{"full_name":"Kueng, Richard","last_name":"Kueng","first_name":"Richard"},{"first_name":"Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym"}],"publication":"PRX Quantum","doi":"10.1103/prxquantum.3.020365","type":"journal_article","publication_identifier":{"issn":["2691-3399"]},"oa":1,"title":"Avoiding barren plateaus using classical shadows","article_number":"020365","oa_version":"Published Version","status":"public","_id":"11471","year":"2022","acknowledgement":"We thank Marco Cerezo, Zoe Holmes, and Nicholas Hunter-Jones for fruitful discussion and valuable feedback. We also acknowledge Adam Smith, Johannes Jakob Meyer, and Victor V. Albert for comments on the paper. The simulations were performed in the Julia programming\r\nlanguage [65] using the Yao module [66]. S.H.S., R.A.M., A.A.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899).","citation":{"mla":"Sack, Stefan, et al. “Avoiding Barren Plateaus Using Classical Shadows.” <i>PRX Quantum</i>, vol. 3, no. 2, 020365, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/prxquantum.3.020365\">10.1103/prxquantum.3.020365</a>.","short":"S. Sack, R.A. Medina Ramos, A. Michailidis, R. Kueng, M. Serbyn, PRX Quantum 3 (2022).","chicago":"Sack, Stefan, Raimel A Medina Ramos, Alexios Michailidis, Richard Kueng, and Maksym Serbyn. “Avoiding Barren Plateaus Using Classical Shadows.” <i>PRX Quantum</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/prxquantum.3.020365\">https://doi.org/10.1103/prxquantum.3.020365</a>.","ieee":"S. Sack, R. A. Medina Ramos, A. Michailidis, R. Kueng, and M. Serbyn, “Avoiding barren plateaus using classical shadows,” <i>PRX Quantum</i>, vol. 3, no. 2. American Physical Society, 2022.","apa":"Sack, S., Medina Ramos, R. A., Michailidis, A., Kueng, R., &#38; Serbyn, M. (2022). Avoiding barren plateaus using classical shadows. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.3.020365\">https://doi.org/10.1103/prxquantum.3.020365</a>","ista":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. 2022. Avoiding barren plateaus using classical shadows. PRX Quantum. 3(2), 020365.","ama":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. Avoiding barren plateaus using classical shadows. <i>PRX Quantum</i>. 2022;3(2). doi:<a href=\"https://doi.org/10.1103/prxquantum.3.020365\">10.1103/prxquantum.3.020365</a>"},"publisher":"American Physical Society","day":"29","arxiv":1,"isi":1,"file":[{"content_type":"application/pdf","date_updated":"2022-06-30T07:14:48Z","creator":"dernst","relation":"main_file","checksum":"a7706b28d24a0e32a55ea04b82a2df43","access_level":"open_access","file_name":"2022_PRXQuantum_Sack.pdf","file_size":4231591,"date_created":"2022-06-30T07:14:48Z","file_id":"11472","success":1}],"intvolume":"         3","external_id":{"isi":["000822564300001"],"arxiv":["2201.08194"]},"issue":"2","date_updated":"2026-10-25T23:31:09Z","abstract":[{"text":"Variational quantum algorithms are promising algorithms for achieving quantum advantage on nearterm devices. The quantum hardware is used to implement a variational wave function and measure observables, whereas the classical computer is used to store and update the variational parameters. The optimization landscape of expressive variational ansätze is however dominated by large regions in parameter space, known as barren plateaus, with vanishing gradients, which prevents efficient optimization. In this work we propose a general algorithm to avoid barren plateaus in the initialization and throughout the optimization. To this end we define a notion of weak barren plateaus (WBPs) based on the entropies of local reduced density matrices. The presence of WBPs can be efficiently quantified using recently introduced shadow tomography of the quantum state with a classical computer. We demonstrate that avoidance of WBPs suffices to ensure sizable gradients in the initialization. In addition, we demonstrate that decreasing the gradient step size, guided by the entropies allows WBPs to be avoided during the optimization process. This paves the way for efficient barren plateau-free optimization on near-term devices. ","lang":"eng"}],"ec_funded":1,"file_date_updated":"2022-06-30T07:14:48Z","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_type":"original","fulldoi":"https://doi.org/10.1103/prxquantum.3.020365","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"keyword":["General Medicine"],"ddc":["530"],"has_accepted_license":"1","date_published":"2022-06-29T00:00:00Z"}]