Density of States in Two-Dimensional Square Lattices Around Half Filling with Strong Impurities

GU Yu,YANG Yong-Hong,WANG Yong-Gang,ZHANG Qun

理论物理通讯 ›› 2005, Vol. 43 ›› Issue (04) : 743-748.

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会计学季刊
Quarterly Journal of Accounting
主办单位:
香港中文大学会计学院
上海财经大学会计学院
南京大学商学院会计学系
ISSN: 3006-1415
PDF(218 KB)
理论物理通讯 ›› 2005, Vol. 43 ›› Issue (04) : 743-748.

Density of States in Two-Dimensional Square Lattices Around Half Filling with Strong Impurities

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Density of States in Two-Dimensional Square Lattices Around Half Filling with Strong Impurities

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Abstract

We calculate the lowest-order quantum-interference correction to the density of states (DOS) of weakly-disordered two-dimensional (2D) tight-binding square lattices around half filling. The impurities are assumed to be randomly distributed on small fractions of the sites, and have a strong potential yielding a unitary-limit scattering. In addition to the usual diffusive modes in the retarded-advanced channel, there appear diffusive π modes in the retarded-retarded (or advanced-advanced) channel due to the existence of particle-hole symmetry. It is found that the π-mode diffuson gives rise to a logarithmic suppression to the DOS near the band center, which prevails over the positive correction contributed by π-mode cooperon. As a result, the DOS is subject to a negative total correction. This result is qualitatively different from the divergent behavior of the DOS at the band center predicted previously for disordered 2D two-sublattice models with the particle-hole symmetry.

关键词

weak-localization / density of states / two-dimensional lattice

Key words

weak-localization / density of states / two-dimensional lattice

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GU Yu, YANG Yong-Hong, WANG Yong-Gang, . Density of States in Two-Dimensional Square Lattices Around Half Filling with Strong Impurities[J]. 理论物理通讯, 2005, 43(04): 743-748
GU Yu, YANG Yong-Hong, WANG Yong-Gang, et al. Density of States in Two-Dimensional Square Lattices Around Half Filling with Strong Impurities[J]. Communications in Theoretical Physics, 2005, 43(04): 743-748
中图分类号: 73.20.Fz    73.20.At    71.20.-b   

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