The asymmetric single-impurity Anderson model - the modified perturbation theory

Details The asymmetric single-impurity Anderson model - the modified perturbation theory The asymmetric single-impurity Anderson model - the modified perturbation theory

1999-05-07

arxiv.org/abs/cond-mat/9905089v1

Physica B 270, 225 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures, to appear in Physica B

Scientific paper

10.1016/S0921-4526(99)00183-0

We investigate the single-impurity Anderson model by means of the recently introduced modified perturbation theory. This approximation scheme yields reasonable results away from the symmetric case. The agreement with exactly known results for the symmetric case is checked, and results for the non-symmetric case are presented. With decreasing conduction band occupation, the breakdown of the screening of the local moment is observed. In the crossover regime between Kondo limit and mixed-valence regime, an enhanced zero-temperature susceptibility is found.

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