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Conductance through quantum wires with Lévy-type disorder: Universal statistics in anomalous quantum transport

机译:具有Lévy型无序的量子线的电导:异常量子传输中的通用统计

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Abstract – In this letter we study the conductance G through one-dimensional quantum wires with disorder configurations characterized by long-tailed distributions (Lévy-type disorder). We calculate analytically the conductance distribution which reveals a universal statistics: the distribution of conductances is fully determined by the exponent α of the power-law decay of the disorder distribution and the average (lnG), i.e., all other details of the disorder configurations are irrelevant. For 0<α<1 we found that the fluctuations of lnG are not self-averaging and (lnG) scales with the length of the system as Lα, in contrast to the predictions of the standard scaling theory of localization where lnG is a self-averaging quantity and (lnG) scales linearly with L. Our theoretical results are verified by comparing with numerical simulations of one-dimensional disordered wires.
机译:摘要–在这封信中,我们研究了通过具有长尾分布(Lévy型无序)的无序结构的一维量子线对电导G的研究。我们通过分析来计算电导分布,从而揭示出一个通用的统计数据:电导的分布完全由无序分布的幂律衰减的指数α和平均值(lnG)决定,即,无序配置的所有其他详细信息都是不相关的。对于0 <α<1,我们发现lnG的波动不是自平均的,并且(lnG)的标度以系统长度为Lα,与标准的局部定标理论的预测相反,其中lnG是自平均数量和(lnG)标度与L呈线性关系。通过与一维无序导线的数值模拟进行比较,我们的理论结果得到了验证。

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