---
OA_place: repository
OA_type: green
_id: '23095'
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\x05β 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."
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."
article_number: '084306'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jiang
  full_name: Shengtao, Jiang
  last_name: Shengtao
- first_name: Jean-Yves Marc
  full_name: Desaules, Jean-Yves Marc
  id: 6c292945-a610-11ed-9eec-c3be1ad62a80
  last_name: Desaules
  orcid: 0000-0002-3749-6375
- first_name: Marko
  full_name: Ljubotina, Marko
  id: F75EE9BE-5C90-11EA-905D-16643DDC885E
  last_name: Ljubotina
  orcid: 0000-0003-0038-7068
- first_name: Thomas
  full_name: Scaffidi, Thomas
  last_name: Scaffidi
citation:
  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>
  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.
  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.
  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>.
  short: J. Shengtao, J.-Y.M. Desaules, M. Ljubotina, T. Scaffidi, Physical Review
    B 114 (2026).
das_tickbox: '1'
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."
date_created: 2026-10-11T22:02:06Z
date_published: 2026-08-21T00:00:00Z
date_updated: 2026-10-14T05:44:58Z
day: '21'
department:
- _id: MaSe
doi: 10.1103/mx9k-1mc6
ec_funded: 1
external_id:
  arxiv:
  - '2605.19281'
fulldoi: https://doi.org/10.1103/mx9k-1mc6
intvolume: '       114'
issue: '8'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2605.19281
month: '08'
oa: 1
oa_version: Preprint
project:
- _id: fc2ed2f7-9c52-11eb-aca3-c01059dda49c
  call_identifier: H2020
  grant_number: '101034413'
  name: 'IST-BRIDGE: International postdoctoral program'
publication: Physical Review B
publication_identifier:
  eissn:
  - 2469-9969
  issn:
  - 2469-9950
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
researchdata_availability: upon request
scopus_import: '1'
status: public
supplementarymaterial: yes
title: Finite-temperature crossover from coherent magnons to energy superdiffusion
  in the PXP model
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 114
year: '2026'
...