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arXiv 1607.04762cond-mat.str-elcond-mat.dis-nn
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量子纠缠对无序分数量子霍尔液体相变的诊断

Quantum Entanglement as a Diagnostic of Phase Transitions in Disordered Fractional Quantum Hall Liquids

Zhao Liu, R. N. Bhatt

摘要:

利用量子纠缠方法研究了无序驱动的分数量子霍尔态到安德森绝缘体的相变。我们发现,过渡的信号是一个适当的平均纠缠熵的灵敏度急剧增加,相对于无序-其无序衍生物的大小出现分歧的热力学极限。我们还研究了作为无序函数的纠缠谱的能级统计。然而,不像戏剧性的相变信号的纠缠熵的衍生物,我们发现一个逐步减少的水平排斥只深在安德森绝缘相。

英文摘要:

We investigate the disorder-driven phase transition from a fractional quantum Hall state to an Anderson insulator using quantum entanglement methods. We find that the transition is signaled by a sharp increase in the sensitivity of a suitably averaged entanglement entropy with respect to disorder -- the magnitude of its disorder derivative appears to diverge in the thermodynamic limit. We also study the level statistics of the entanglement spectrum as a function of disorder. However, unlike the dramatic phase-transition signal in the entanglement entropy derivative, we find a gradual reduction of level repulsion only deep in the Anderson insulating phase.

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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