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arXiv 0902.4847cond-mat.mes-hallcond-mat.dis-nn
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分层系统中的无序离域

Delocalization by Disorder in Layered Systems

Dmitrii L. Maslov, Vladimir I. Yudson, Andres M. Somoza, Miguel Ortuño

摘要:

出于极大的导电性各向异性的层状材料,我们提出了一个简单的模型,随机间隔的势垒(模仿堆垛层错)与各向同性杂质之间的障碍。我们解决这个模型的数值和分析,利用一维(1D)无序系统的电导率的精确解。在没有体无序的情况下,电子在面外方向上的运动是局部化的。块体无序破坏1D定位。其结果是,平面外的导电性是有限的,并与体杂质的散射率成线性比例,直到平面和体无序变得可比。的\emph{ac}面外电导率是一个明显的非德鲁德形式,在对应于散射率的势垒的频率最大。

英文摘要:

Motivated by anomalously large conductivity anisotropy in layered materials, we propose a simple model of randomly spaced potential barriers (mimicking stacking faults) with isotropic impurities in between the barriers. We solve this model both numerically and analytically, by utilizing an exact solution for the conductivity of a one-dimensional (1D) disordered system. In the absence of bulk disorder, electron motion in the out-of-plane direction is localized. Bulk disorder destroys 1D localization. As a result, the out-of-plane conductivity is finite and scales linearly with the scattering rate by bulk impurities until planar and bulk disorder become comparable. The \emph{ac} out-of-plane conductivity is of a manifestly non-Drude form, with a maximum at the frequency corresponding to the scattering rate by potential barriers.

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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