[{"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"citation":{"short":"J. Shengtao, J.-Y.M. Desaules, M. Ljubotina, T. Scaffidi, Physical Review B 114 (2026).","apa":"Shengtao, J., Desaules, J.-Y. M., Ljubotina, M., &#38; Scaffidi, T. (2026). Finite-temperature crossover from coherent magnons to energy superdiffusion in the PXP model. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/mx9k-1mc6\">https://doi.org/10.1103/mx9k-1mc6</a>","chicago":"Shengtao, Jiang, Jean-Yves Marc Desaules, Marko Ljubotina, and Thomas Scaffidi. “Finite-Temperature Crossover from Coherent Magnons to Energy Superdiffusion in the PXP Model.” <i>Physical Review B</i>. American Physical Society, 2026. <a href=\"https://doi.org/10.1103/mx9k-1mc6\">https://doi.org/10.1103/mx9k-1mc6</a>.","ieee":"J. Shengtao, J.-Y. M. Desaules, M. Ljubotina, and T. Scaffidi, “Finite-temperature crossover from coherent magnons to energy superdiffusion in the PXP model,” <i>Physical Review B</i>, vol. 114, no. 8. American Physical Society, 2026.","ama":"Shengtao J, Desaules J-YM, Ljubotina M, Scaffidi T. Finite-temperature crossover from coherent magnons to energy superdiffusion in the PXP model. <i>Physical Review B</i>. 2026;114(8). doi:<a href=\"https://doi.org/10.1103/mx9k-1mc6\">10.1103/mx9k-1mc6</a>","mla":"Shengtao, Jiang, et al. “Finite-Temperature Crossover from Coherent Magnons to Energy Superdiffusion in the PXP Model.” <i>Physical Review B</i>, vol. 114, no. 8, 084306, American Physical Society, 2026, doi:<a href=\"https://doi.org/10.1103/mx9k-1mc6\">10.1103/mx9k-1mc6</a>.","ista":"Shengtao J, Desaules J-YM, Ljubotina M, Scaffidi T. 2026. Finite-temperature crossover from coherent magnons to energy superdiffusion in the PXP model. Physical Review B. 114(8), 084306."},"acknowledgement":"We thank M. Serbyn, S. White, and T. Iadecola for insightful discussions. Work by T.S. was supported by the U.S.\r\nDepartment of Energy, Office of Science, Office of Basic\r\nEnergy Sciences under Early Career Research Program Award\r\nNo. DE-SC0025568. T.S. gratefully acknowledges the Institute of Science and Technology Austria (ISTA) for hosting\r\nhim during the initial stages of this project. S.J. is supported by the U.S. Department of Energy, Office of Science,\r\nBasic Energy Sciences, Materials Sciences and Engineering\r\nDivision, under Contract No. DE-AC02-76SF00515. M.L.\r\nacknowledges support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s\r\nExcellence Strategy—EXC-2111—390814868. J.-Y.D. acknowledges funding from the European Union’s Horizon\r\n2020 Research and innovation program under the Marie\r\nSkłodowska-Curie Grant Agreement No. 101034413.","issue":"8","language":[{"iso":"eng"}],"oa_version":"Preprint","publication":"Physical Review B","ec_funded":1,"scopus_import":"1","article_type":"original","day":"21","abstract":[{"lang":"eng","text":"The PXP chain was recently shown to exhibit superdiffusive energy transport with Kardar-Parisi-Zhang-like\r\nscaling, z ≈ 3/2, joining a growing number of spin chains with this exponent. An understanding of how this\r\nanomalous hydrodynamics emerges from microscopics is, however, still lacking. In this work, we show that\r\nfinite-temperature energy transport in this model provides a window into the emergence of superdiffusion. At\r\nfinite temperature, the energy autocorrelation function exhibits a crossover from short-time coherent dynamics to\r\nlong-time hydrodynamics. The short-time behavior is dominated by a single magnon band and can be understood\r\nanalytically. In momentum space, this regime is characterized by spectral weight near q = π. The damping time\r\nτ , which separates the short-time magnon-dominated behavior from the late-time hydrodynamics, grows rapidly\r\nupon cooling, consistent with an activated form τ (β) ∼ βe\u0005β with a gap scale set by the magnon band. At longer\r\ntimes, the spectral weight transfers to q = 0 and the running decay exponent drifts toward the superdiffusive\r\nvalue z = 3/2. Finite-temperature energy transport therefore provides a bridge between microscopic magnon\r\nphysics and late-time superdiffusion in the PXP model."}],"volume":114,"supplementarymaterial":"yes","project":[{"name":"IST-BRIDGE: International postdoctoral program","grant_number":"101034413","call_identifier":"H2020","_id":"fc2ed2f7-9c52-11eb-aca3-c01059dda49c"}],"researchdata_availability":"upon request","external_id":{"arxiv":["2605.19281"]},"dataavailabilitystatement":"There are no publicly available research data or software\r\nsupporting this manuscript. Requests for further information\r\nor data should be sent to the authors.","article_number":"084306","date_created":"2026-10-11T22:02:06Z","publication_status":"published","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2605.19281","open_access":"1"}],"article_processing_charge":"No","OA_place":"repository","month":"08","department":[{"_id":"MaSe"}],"OA_type":"green","fulldoi":"https://doi.org/10.1103/mx9k-1mc6","das_tickbox":"1","arxiv":1,"date_published":"2026-08-21T00:00:00Z","type":"journal_article","oa":1,"author":[{"first_name":"Jiang","last_name":"Shengtao","full_name":"Shengtao, Jiang"},{"full_name":"Desaules, Jean-Yves Marc","last_name":"Desaules","orcid":"0000-0002-3749-6375","first_name":"Jean-Yves Marc","id":"6c292945-a610-11ed-9eec-c3be1ad62a80"},{"id":"F75EE9BE-5C90-11EA-905D-16643DDC885E","first_name":"Marko","orcid":"0000-0003-0038-7068","last_name":"Ljubotina","full_name":"Ljubotina, Marko"},{"first_name":"Thomas","full_name":"Scaffidi, Thomas","last_name":"Scaffidi"}],"publisher":"American Physical Society","intvolume":"       114","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","date_updated":"2026-10-14T05:44:58Z","year":"2026","title":"Finite-temperature crossover from coherent magnons to energy superdiffusion in the PXP model","doi":"10.1103/mx9k-1mc6","_id":"23095"}]