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arXiv 0709.2639cond-mat.stat-mech
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量子自旋链中的功涨落

Work fluctuations in quantum spin chains

Sven Dorosz, Thierry Platini, Dragi Karevski

摘要:

在涨落关系和Jarzynski等式的基础上,研究了两类有限量子自旋链在含时磁场作用下的功涨落。这两类量子链分别对应于纵向磁场中的可积伊辛量子链和不可积XX量子链。对于几种磁场协议,量子Crooks和Jarzynski关系的数值测试和履行。作为一个更有趣的情况下,我们考虑强制制度的周期性磁场的应用。在伊辛的情况下,我们给出了一个精确的解决方案的双重合流Heun功能。我们表明,由外部周期性漂移进行的工作的波动是最大的频率成比例的字段的振幅。在不可积的情况下,我们表明,依赖于场频率的急剧过渡之间观察到泊松极限工作分布在高频率的正常工作分布在低频率。

英文摘要:

We study the work fluctuations of two types of finite quantum spin chains under the application of a time-dependent magnetic field in the context of the fluctuation relation and Jarzynski equality. The two types of quantum chains correspond to the integrable Ising quantum chain and the nonintegrable XX quantum chain in a longitudinal magnetic field. For several magnetic field protocols, the quantum Crooks and Jarzynski relations are numerically tested and fulfilled. As a more interesting situation, we consider the forcing regime where a periodic magnetic field is applied. In the Ising case we give an exact solution in terms of double-confluent Heun functions. We show that the fluctuations of the work performed by the external periodic drift are maximum at a frequency proportional to the amplitude of the field. In the nonintegrable case, we show that depending on the field frequency a sharp transition is observed between a Poisson-limit work distribution at high frequencies toward a normal work distribution at low frequencies.

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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