---
res:
  bibo_abstract:
  - The eigenstate thermalization hypothesis (ETH) posits how isolated quantum many-body
    systems thermalize, assuming that individual eigenstates at the same energy density
    have identical expectation values of local observables in the limit of large systems.
    While the ETH apparently holds across a wide range of interacting quantum systems,
    in this work, we show that it may require generalization in the presence of thermal
    first-order phase transitions. We introduce a class of all-to-all spin models,
    featuring first-order thermal phase transitions that stem from two distinct local
    maxima of entropy (two mean-field solutions that we dub “branches”) that exchange
    dominance in the many-body density of states as the energy is varied. We argue
    that, for energies in the vicinity of the thermal phase transition, eigenstate
    expectation values do not need to converge to the same thermal value. The system
    has a regime with coexistence of two classes of eigenstates corresponding to the
    two branches with distinct expectation values at the same energy density and another
    regime with Schrödinger-cat-like eigenstates that are interbranch superpositions;
    these two regimes are separated by an eigenstate phase transition. We propose
    a more general form of the ETH , support our results by semiclassical calculations
    and an exact diagonalization study of a microscopic spin model, and argue that
    the structure of eigenstates in the vicinity of thermal first-order phase transitions
    can be experimentally probed via nonequilibrium dynamics.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Maksym
      foaf_name: Serbyn, Maksym
      foaf_surname: Serbyn
      foaf_workInfoHomepage: http://www.librecat.org/personId=47809E7E-F248-11E8-B48F-1D18A9856A87
    orcid: 0000-0002-2399-5827
  - foaf_Person:
      foaf_givenName: Alexander
      foaf_name: Avdoshkin, Alexander
      foaf_surname: Avdoshkin
  - foaf_Person:
      foaf_givenName: Oriana K.
      foaf_name: Diessel, Oriana K.
      foaf_surname: Diessel
  - foaf_Person:
      foaf_givenName: David A.
      foaf_name: Huse, David A.
      foaf_surname: Huse
  bibo_doi: 10.1103/4zs8-7kf4
  bibo_issue: '3'
  bibo_volume: 16
  dct_date: 2026^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2160-3308
  dct_language: eng
  dct_publisher: American Physical Society@
  dct_title: Eigenstate thermalization in thermal first-order phase transitions@
...