article published yes Pietro Brighi author 4115AF5C-F248-11E8-B48F-1D18A9856A870000-0002-7969-2729 Marko Ljubotina author F75EE9BE-5C90-11EA-905D-16643DDC885E0000-0003-0038-7068 Dmitry A. Abanin author Maksym Serbyn author 47809E7E-F248-11E8-B48F-1D18A9856A870000-0002-2399-5827 MaSe department Non-Ergodic Quantum Matter: Universality, Dynamics and Control project 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. https://research-explorer.ista.ac.at/download/13963/13981/2023_PhysRevB_Brighi.pdf application/pdfno American Physical Society2023 eng 2469-9950 2469-9969 2303.1687610.1103/physrevb.108.054201 1085 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> 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>. 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. 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>. 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. 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> P. Brighi, M. Ljubotina, D.A. Abanin, M. Serbyn, Physical Review B 108 (2023). 139632023-08-05T18:25:22Z2025-04-14T07:52:06Z