Quantum Ergodicity in the Many-Body Localization Problem

Felipe Monteiro, Masaki Tezuka, Alexander Altland, David A. Huse, Tobias Micklitz

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We generalize Page’s result on the entanglement entropy of random pure states to the many-body eigenstates of realistic disordered many-body systems subject to long-range interactions. This extension leads to two principal conclusions: first, for increasing disorder the “shells” of constant energy supporting a system’s eigenstates fill only a fraction of its full Fock space and are subject to intrinsic correlations absent in synthetic high-dimensional random lattice systems. Second, in all regimes preceding the many-body localization transition individual eigenstates are thermally distributed over these shells. These results, corroborated by comparison to exact diagonalization for an SYK model, are at variance with the concept of “nonergodic extended states” in many-body systems discussed in the recent literature.

Original languageEnglish (US)
Article number030601
JournalPhysical review letters
Issue number3
StatePublished - Jul 16 2021

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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