Quantum quench from a thermal initial state

被引：109
作者：
Sotiriadis, S. [1 ]
Calabrese, P. [2 ]
Cardy, J. [1 ,3 ]
机构：
[1] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England
[2] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy
[3] Univ Oxford All Souls Coll, Oxford OX1 4AL, England
来源：
EPL | 2009年 / 87卷 / 02期
基金：
英国工程与自然科学研究理事会;
关键词：
ENTANGLEMENT; RELAXATION;
D O I：
10.1209/0295-5075/87/20002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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. Copyright (C) EPLA, 2009
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页数：6
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