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arXiv 1202.2392cond-mat.mes-hall
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作为电压探针的相干势近似

Coherent Potential Approximation as a Voltage Probe

M. Ye. Zhuravlev, A. V. Vedyayev, K. D. Belashchenko, E. Y. Tsymbal

摘要:

相干势近似(CPA)已被广泛用于研究块体合金的剩余电阻率和结构无序非均匀系统的电导率。在这里,我们重新审视单网站CPA内的Landauer-Büttiker方法应用于电子输运的层状结构,并表明,这种方法可以解释的Büttiker的电压探针模型,已开发用于治疗相破散射介观系统。我们表明,在现场的顶点功能,其中出现在单网站CPA形式主义发挥了作用的局部化学势内的电压探针的方法。这种解释允许确定的化学势分布的无序导体,这是有用的分析内的CPA的运输计算的结果。我们通过提供几个例子来说明这种方法。特别地,对于在层的平面中具有平移周期性的层状系统,我们引入局部电阻率并计算无序层之间的界面电阻。

英文摘要:

Coherent potential approximation (CPA) has widely been used for studying residual resistivity of bulk alloys and electrical conductivity in inhomogeneous systems with structural disorder. Here we revisit the single-site CPA within the Landauer-Büttiker approach applied to the electronic transport in layered structures and show that this method can be interpreted in terms of the Büttiker's voltage-probe model that has been developed for treating phase breaking scattering in mesoscopic systems. We demonstrate that the on-site vertex function which appears within the single-site CPA formalism plays a role of the local chemical potential within the voltage-probe approach. This interpretation allows the determination of the chemical potential profile across a disordered conductor which is useful for analyzing results of transport calculations within the CPA. We illustrate this method by providing several examples. In particular, for layered systems with translational periodicity in the plane of the layers we introduce the local resistivity and calculate the interface resistance between disordered layers.

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