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arXiv 2201.04673cond-mat.dis-nnquant-ph
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随机正则图上 Anderson 模型中的亚扩散 Thouless 时间标度

Sub-diffusive Thouless time scaling in the Anderson model on random regular graphs

Luis Colmenarez, David J. Luitz, Ivan M. Khaymovich, Giuseppe De Tomasi

AI总结:

本研究探讨了随机正则图上 Anderson 模型中 Thouless 时间的标度,通过谱形式因子和功率谱发现其符合预示局域化相的亚扩散机制,并利用 Floquet 版本验证了该机制。

摘要:

Thouless 时间随系统尺寸的标度对于表征量子系统的动力学特性具有根本重要性。在本研究中,我们研究了具有在位无序的随机正则图上 Anderson 模型中 Thouless 时间的标度。我们通过两个主要量来确定 Thouless 时间:谱形式因子和功率谱。这两个量都探测了系统中的长程谱关联,并允许我们将 Thouless 时间确定为系统在此之后能被随机矩阵理论很好描述的时间尺度。我们发现,Thouless 时间的标度与预示局域化相的亚扩散机制的存在相一致。此外,为了减小有限尺寸效应,我们通过引入模型的 Floquet 版本来打破能量守恒,并表明其具有类似的亚扩散机制。

英文摘要:

The scaling of the Thouless time with system size is of fundamental importance to characterize dynamical properties in quantum systems. In this work, we study the scaling of the Thouless time in the Anderson model on random regular graphs with on-site disorder. We determine the Thouless time from two main quantities: the spectral form factor and the power spectrum. Both quantities probe the long-range spectral correlations in the system and allow us to determine the Thouless time as the time scale after which the system is well described by random matrix theory. We find that the scaling of the Thouless time is consistent with the existence of a sub-diffusive regime anticipating the localized phase. Furthermore, to reduce finite-size effects, we break energy conservation by introducing a Floquet version of the model and show that it hosts a similar sub-diffusive regime.

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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