Fluctuation-dissipation theorem in isolated quantum systems out of equilibrium

Ehsan Khatami, Guido Pupillo, Mark Srednicki, Marcos Rigol

Research output: Contribution to journalConference articlepeer-review

Abstract

We study the validity of the fluctuation-dissipation theorem for an isolated quantum system of harmonically trapped dipolar molecules taken out of equilibrium by means of a quench, a sudden change in the Hamiltonian parameters. We find that the integrability of the system plays a crucial role in the validity of the fluctuation-dissipation theorem. Namely, the system thermalizes according to the eigenstate thermalization hypothesis and the theorem holds if the system is nonintegrable after the quench. However, it fails if the system is integrable, unless the initial state is an eigenstate of a nonintegrable Hamiltonian, in which case the system still thermalizes despite the eigenstate thermalization hypothesis failing to describe it.

Original languageEnglish (US)
Article number012035
JournalJournal of Physics: Conference Series
Volume510
Issue number1
DOIs
StatePublished - 2014
Event25th IUPAP Conference on Computational Physics, CCP 2013 - Moscow, Russian Federation
Duration: Aug 20 2013Aug 24 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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