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arXiv 1608.02869cond-mat.stat-mechmath-phmath.MPquant-ph
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量子自旋链中的电荷和电流:晚期动力学和自发电流

Charges and currents in quantum spin chains: late-time dynamics and spontaneous currents

Maurizio Fagotti

摘要:

我们回顾了非相互作用自旋链中守恒律的结构,并揭示了相应电流的形式表达式。我们简要讨论了交互作用如何影响图片。在第二部分中,我们探讨了局部缺陷的影响。我们发现,缺陷附近的自发电流的出现破坏了任何描述的晚时间动态的一个有限的链中的稳态。特别是,对角线合奏不起作用。最后,我们提供了数值证据,简单的通用本地化缺陷是不足以引起热化。

英文摘要:

We review the structure of the conservation laws in noninteracting spin chains and unveil a formal expression for the corresponding currents. We briefly discuss how interactions affect the picture. In the second part, we explore the effects of a localized defect. We show that the emergence of spontaneous currents near the defect undermines any description of the late-time dynamics by means of a stationary state in a finite chain. In particular, the diagonal ensemble does not work. Finally, we provide numerical evidence that simple generic localized defects are not sufficient to induce thermalization.

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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