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arXiv 0901.0379cond-mat.mes-hallcond-mat.mtrl-sci
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薄膜中的反常量子输运

Anomalous quantum transport in a thin film

Santanu K. Maiti

摘要:

我们提出了一个电子输运的薄膜中的不同的无序强度与距离其表面的数值研究。一个简单的紧束缚模型被用来描述的系统,其中的膜是连接到两个金属电极和耦合的电极,这一膜的Newns-Anderson化学吸附理论说明。有趣的是,我们观察到,在平滑变化的无序薄膜电流的振幅增加与无序强度的增加在强无序制度,而在弱无序制度减少。这一行为与传统无序薄膜中电流幅值总是随无序强度的增加而减小的现象完全相反。

英文摘要:

We present a numerical study of electron transport in a thin film of varying disorder strength with the distance from its surface. A simple tight-binding model is used to describe the system, in which the film is attached to two metallic electrodes and the coupling of this film to the electrodes is illustrated by the Newns-Anderson chemisorption theory. Quite interestingly we observe that, in the smoothly varying disordered film current amplitude increases with the increase of disorder strength in the strong disorder regime, while it decreases in the weak disorder regime. This behavior is completely opposite from a conventional disordered film, where current amplitude always decreases with the increase of disorder strength.

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