arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.5712cond-mat.dis-nn
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一维和二维对角Anderson无序模型的有效团簇典型介质理论

Effective Cluster Typical Medium Theory for Diagonal Anderson Disorder Model in One- and Two-Dimensions

Chinedu E. Ekuma, Hanna Terletska, Zi Yang Meng, Juana Moreno, Mark Jarrell, Samiyeh Mahmoudian, Vladimir Dobrosavljevic

摘要:

我们发展了一个团簇典型介质理论来研究无序电子系统中的局域化。我们的形式主义是能够纳入非本地相关性超出当地的典型介质理论在一个系统的方式。集团典型介质理论利用动量分辨的典型态密度和杂化函数来描述局域化跃迁。我们适用于形式主义的安德森模型的本地化在一个和两个维度。在一个维度上,我们发现临界无序强度与线性簇大小成反比,具有幂律关系,$W_c \sim (1/L_c)^{1/ν}$ ;而在两个维度上,临界无序强度随线性簇大小呈幂律下降。我们的结果与以前的数值计算结果是一致的,并与单参数标度理论。

英文摘要:

We develop a cluster typical medium theory to study localization in disordered electronic systems. Our formalism is able to incorporate non-local correlations beyond the local typical medium theory in a systematic way. The cluster typical medium theory utilizes the momentum resolved typical density of states and hybridization function to characterize the localization transition. We apply the formalism to the Anderson model of localization in one- and two-dimensions. In one dimension, we find that the critical disorder strength scales inversely with the linear cluster size with a power-law, $W_c \sim (1/L_c)^{1/ν}$; whereas in two dimensions, the critical disorder strength decreases logarithmically with the linear cluster size. Our results are consistent with previous numerical work and in agreement with the one-parameter scaling theory.

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