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arXiv 1010.2620cond-mat.stat-mech
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开放量子系统中的热力学反常:各向同性XY模型中的强耦合效应

Thermodynamic anomalies in open quantum systems: Strong coupling effects in the isotropic XY model

Michele Campisi, David Zueco, Peter Talkner

摘要:

利用一维各向同性XY自旋链的精确可解模型研究开放系统的热力学。为此,将链条细分为两部分,一部分被视为系统,而其余部分被视为环境或浴室。该体系的平衡性质表现出负熵、负比热、负磁化率随温度的变化以及体系与熔池之间的耦合强度等反常现象。用简化的密度矩阵研究了该系统的统计力学。在零温度下,对于一定的参数值,我们观察到基态的变化,这种情况类似于量子相变。

英文摘要:

The exactly solvable model of a one dimensional isotropic XY spin chain is employed to study the thermodynamics of open systems. For this purpose the chain is subdivided into two parts, one part is considered as the system while the rest as the environment or bath. The equilibrium properties of the system display several anomalous aspects such as negative entropies, negative specific heat, negative susceptibilities in dependence of temperature and coupling strength between system and bath. The statistical mechanics of this system is studied in terms of a reduced density matrix. At zero temperature and for a certain parameter values we observe a change of the ground state, a situation akin to a quantum phase transition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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