Quantum Quench from a Thermal Initial State

Details Quantum Quench from a Thermal Initial State Quantum Quench from a Thermal Initial State

2009-03-05

arxiv.org/abs/0903.0895v2

EPL 87 (2009) 20002

Physics

Condensed Matter

Statistical Mechanics

6 pages, 2 figures; short published version, added references, minor changes

Scientific paper

10.1209/0295-5075/87/20002

We consider a quantum quench in a system of free bosons, starting from a thermal initial state. As in the case where the system is initially in the ground state, any finite subsystem eventually reaches a stationary thermal state with a momentum-dependent effective temperature. We find that this can, in some cases, even be lower than the initial temperature. We also study lattice effects and discuss more general types of quenches.

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