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arXiv 2301.09520cond-mat.mes-hallcond-mat.str-el
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无安德森局域化的无序Floquet拓扑绝缘体中的量子化电荷输运

Quantized charge transport in disordered Floquet topological insulators in the absence of Anderson localization

Lennard Berg, Andreas Alvermann, Holger Fehske

AI总结:

本研究通过数值模拟探究含时间无序的Floquet拓扑绝缘体,发现无安德森局域化时量子化电荷输运可与扩散体运动共存,揭示了输运的瞬态与长时间双区域特征及统一标度律。

摘要:

我们对含时间无序的Floquet拓扑绝缘体开展数值研究,以探究无安德森局域化时量子化电荷输运的存在性。我们首先指出,在存在时间缺陷的结构中,不会出现安德森局域化,但长时间极限下体输运呈扩散性。第二步,我们计算了时间无序导致的累积平均抽运电荷修正,发现输运具有两个特征区域:瞬态区(非关联无序下表现为平台),以及长时间行为区(非关联与关联无序均遵循统一标度律)。最值得注意的是,我们的数值结果表明,长时间极限下动力学修正消失,因此量子化电荷输运与扩散体运动可共存于含时间无序的Floquet拓扑绝缘体中。

英文摘要:

We perform a numerical study of Floquet topological insulators with temporal disorder to investigate the existence of quantized charge transport without Anderson localization. We first argue that in setups with temporal imperfections Anderson localization can not be expected but bulk transport is diffusive in the long-time limit. In a second step we compute the corrections to the cumulative averaged pumped charge due to the temporal disorder and show that transport is characterized by two regimes: the transient regime, represented by a plateau for uncorrelated disorder, and the long-time behavior with a common scaling law for both uncorrelated and correlated disorder. Most notably, our numerical results indicate that the dynamic corrections vanish in the long-time limit such that quantized charge transport and diffusive bulk motion can coexist in temporally disordered Floquet topological insulators.

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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