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arXiv 1806.02555cond-mat.stat-mechcond-mat.dis-nncond-mat.quant-gasquant-ph
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多体量子系统中的无序不可逆功约化

Irreversible Work Reduction by Disorder in Many-Body Quantum Systems

Yuanjian Zheng, Dario Poletti

摘要:

我们研究了无序对与量子哈密顿过程相关的功交换的影响,考虑了伊辛自旋链,其中自旋之间的耦合强度随机地从正态分布或伽马分布中抽取。链受到外部横向场的猝灭,这引起了这种功的交换。特别是,我们研究了不可逆的工作所引起的淬火作为初始温度,场强和无序的大小的函数。虽然弱无序的存在通常会增加所产生的不可逆功,但足够强度的无序反而会减少它,从而产生无序诱导的润滑效应。这种不可逆功的减少取决于所考虑的分布的性质,并且可以从获得正常分布自旋耦合的有效较小淬火的行为,或者在伽马分布耦合的情况下有效的单自旋动力学的行为中产生。

英文摘要:

We study the effect of disorder on work exchange associated to quantum Hamiltonian processes by considering an Ising spin chain in which the strength of coupling between spins are randomly drawn from either Normal or Gamma distributions. The chain is subjected to a quench of the external transverse field which induces this exchange of work. In particular, we study the irreversible work incurred by a quench as a function of the initial temperature, field strength and magnitude of the disorder. While presence of weak disorder generally increases the irreversible work generated, disorder of sufficient strength can instead reduce it, giving rise to a disorder induced lubrication effect. This reduction of irreversible work depends on the nature of the distribution considered, and can either arise from acquiring the behavior of an effectively smaller quench for the Normal-distributed spin couplings, or that of effectively single spin dynamics in the case of Gamma distributed couplings.

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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