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arXiv 0801.0852cond-mat.str-elcond-mat.dis-nn
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局部无序Falicov-Kimball模型中局域态密度的统计

Statistics of local density of states in the Falicov-Kimball model with local disorder

Tran Minh-Tien

摘要:

利用统计动力学平均场论研究了具有局域无序的二维Falicov-Kimball模型中局域态密度的统计性质。在理论范围内,局域态密度及其分布通过随机自洽方程计算。局域态密度的最可几值被用来监测由关联和无序驱动的金属-绝缘体转变。在费米能级处局域态密度的最可几值不为零表明二维无序相互作用系统中存在扩展态。当系统从扩展态过渡到安德森局域化时,局域态密度的最可几值出现不连续性。还提出了相图。

英文摘要:

Statistics of the local density of states in the two-dimensional Falicov-Kimball model with local disorder is studied by employing the statistical dynamical mean-field theory. Within the theory the local density of states and its distributions are calculated through stochastic self-consistent equations. The most probable value of the local density of states is used to monitor the metal-insulator transition driven by correlation and disorder. Nonvanishing of the most probable value of the local density of states at the Fermi energy indicates the existence of extended states in the two-dimensional disordered interacting system. It is also found that the most probable value of the local density of states exhibits a discontinuity when the system crosses from extended states to the Anderson localization. A phase diagram is also presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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