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arXiv 1210.4152cond-mat.str-elcond-mat.dis-nn
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无序电子系统的对偶费米子方法

Dual Fermion Method for Disordered Electronic Systems

H. Terletska, S. -X. Yang, Z. Y. Meng, J. Moreno, M. Jarrell

摘要:

相干势近似(CPA)是研究无序电子系统的常用方法,但它不能捕捉到非局域关联和安德森局域化。为了将这样的效果,我们扩展了双费米子的方法,无序的非相互作用系统使用的副本方法。单粒子和双粒子的结果显示出良好的协议与集群扩展的CPA,此外,弱本地化被捕获。作为CPA的自然扩展,我们的方法提出了一种替代现有的集群理论。它可以用于各种应用,包括无序相互作用系统的研究,或用于描述电子结构计算中的非局域效应。

英文摘要:

While the coherent potential approximation (CPA) is the prevalent method for the study of disordered electronic systems, it fails to capture non-local correlations and Anderson localization. To incorporate such effects, we extend the dual fermion approach to disordered non-interacting systems using the replica method. Results for single- and two- particle quantities show good agreement with cluster extensions of the CPA; moreover, weak localization is captured. As a natural extension of the CPA, our method presents an alternative to the existing cluster theories. It can be used in various applications, including the study of disordered interacting systems, or for the description of non-local effects in electronic structure calculations.

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