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Investigation of the two-particle-self-consistent theory for the single-impurity Anderson model and an extension to the case of strong correlation

Authors
  • 佐宗, 哲郎
  • サソウ, テツロウ
  • Saso, Tetsuro
Publication Date
Jan 01, 2000
Source
Saitama University Cyber Repository of Academic Resources
Keywords
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Abstract

The two-particle-self-consistent theory is applied to the single-impurity Anderson model. It is found that it cannot reproduce the small energy scale in the strong correlation limit. A modified scheme to overcome this difficulty is proposed by introducing an appropriate vertex correction explicitly. Using the same vertex correction, the self-energy is investigated, and it is found that under certain assumptions it reproduces the result of the modified perturbation theory which interpolates the weak and the strong correlation limits.

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