Initial-state dependence of the quench dynamics in integrable quantum systems. II. Thermal states

Kai He, Marcos Rigol

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Abstract

We study properties of isolated integrable quantum systems after a sudden quench starting from thermal states. We show that, even if the system is initially in thermal equilibrium at finite temperature, the diagonal entropy after a quench remains a fraction of the entropy in the generalized ensembles introduced to describe integrable systems after relaxation. The latter is also, in general, different from the entropy in thermal equilibrium. Furthermore, we examine the difference in the distributions of conserved quantities in the thermal versus the generalized ensembles after a quench and show that they are also, in general, different from each other. This explains why these systems fail to thermalize. A finite-size scaling analysis is presented for each quantity, which allows us to make predictions for thermodynamically large lattice sizes.

Original languageEnglish (US)
Article number063609
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume85
Issue number6
DOIs
StatePublished - Jun 11 2012

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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