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arXiv 2201.06813cond-mat.dis-nncond-mat.stat-mech
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准无序晶格系统中的几何猝灭

Geometric quenches in quasi-disordered lattice system

Ravi Kumar, Ranjan Modak

摘要:

虽然在文献中已经广泛使用全局量子猝灭来理解一维量子自旋链的定域-离域跃迁,但是在这种跃迁的背景下几何猝灭(对应于链的几何形状的突然变化)的效果还没有被很好地理解。在这项工作中,我们研究了几何淬火的Aubry-Andre模型,即使在一维支持局域化-离域转换的效果。我们研究了纠缠的扩展和占位随时间的变化,发现了许多有趣的特征,可以用来表征局域-离域转变。我们观察到,几何淬火导致幂律型增长的纠缠熵在离域相的线性增长,这是在全球淬火研究中发现。值得注意的是,我们还发现,在多体局域化(MBL)阶段的饱和值服从面积法,而通常的体积法,这是一个签名功能的MBL阶段的背景下,全球淬火。

英文摘要:

While global quantum quench has been extensively used in the literature to understand the localization-delocalization transition for the one-dimensional quantum spin chain, the effect of geometric quench (which corresponds to a sudden change of the geometry of the chain) in the context of such transitions is yet to be well understood. In this work, we investigate the effect of geometric quench in the Aubry-Andre model, which supports localization-delocalization transition even in one dimension. We study the spreading of the entanglement and the site-occupation with time and find many interesting features that can be used to characterize localization-delocalization transition. We observe that geometric quench causes a power-law type growth of the entanglement entropy in the delocalized phase in contrast to the linear growth which is found in the global quench studies. Remarkably, we also find that the saturation values in the Many-body localized (MBL) phase obey Area law in contrast to the usual volume law which is a signature feature of the MBL phase in the context of global quench.

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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