Study of multiband disordered systems using the typical medium dynamical cluster approximation
Study of multiband disordered systems using the typical medium dynamical cluster approximation
复制标题
使用典型介质动力学簇近似研究多带无序系统
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. Jarrell
中科院分区：
文献类型：
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作者：
Yi Zhang;H. Terletska;C. Moore;C. Ekuma;Ka;T. Berlijn;W. Ku;J. Moreno;M. Jarrell
将典型的中动态簇近似推广到多波段无序系统。利用我们的扩展形式，我们系统地研究了无序引起的非局部相关效应对三维两波段安德森模型的态密度和迁移边缘的影响。我们包括带间和带内跳和带内无序电位。所得结果与传递矩阵法和核多项式法的结果一致。我们还将该方法应用于具有Fe空位的KxFe2-ySe2。尽管该材料具有很强的空位无序性和各向异性，但我们发现该材料不是安德森绝缘体。此外，我们的结果证明了典型的介质动态聚类近似方法在研究实际材料中的安德森局域化中的应用。
We generalize the typical medium dynamical cluster approximation to multiband disordered systems. Using our extended formalism, we perform a systematic study of the nonlocal correlation effects induced by disorder on the density of states and the mobility edge of the three-dimensional two-band Anderson model. We include interband and intraband hopping and an intraband disorder potential. Our results are consistent with those obtained by the transfer matrix and the kernel polynomial methods. We also apply the method to KxFe2-ySe2 with Fe vacancies. Despite the strong vacancy disorder and anisotropy, we find the material is not an Anderson insulator. Moreover our results demonstrate the application of the typical medium dynamical cluster approximation method to study Anderson localization in real materials.