Onset of quantum chaos in one-dimensional bosonic and fermionic systems and its relation to thermalization

Lea F. Santos, Marcos Rigol

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

By means of full exact diagonalization, we study level statistics and the structure of the eigenvectors of one-dimensional gapless bosonic and fermionic systems across the transition from integrability to quantum chaos. These systems are integrable in the presence of only nearest-neighbor terms, whereas the addition of next-nearest-neighbor hopping and interaction may lead to the onset of chaos. We show that the strength of the next-nearest-neighbor terms required to observe clear signatures of nonintegrability is inversely proportional to the system size. Interestingly, the transition to chaos is also seen to depend on particle statistics, with bosons responding first to the integrability breaking terms. In addition, we discuss the use of delocalization measures as main indicators for the crossover from integrability to chaos and the consequent viability of quantum thermalization in isolated systems.

Original languageEnglish (US)
Article number036206
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume81
Issue number3
DOIs
StatePublished - Mar 5 2010

Fingerprint

Quantum Chaos
chaos
Integrability
Nearest Neighbor
Chaos
Term
statistics
Statistics
Non-integrability
Diagonalization
Viability
viability
Bosons
Eigenvector
Crossover
crossovers
eigenvectors
Signature
bosons
Directly proportional

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

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