Investigation of the Two-Particle-Self-Consistent Theory for the Single-Impurity Anderson Model and an Extension to the Case of Strong Correlation

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.

5 pages, 7 figures, submitted to J. Phys. Soc. Jpn

References in corpus (1)

• A Unified Theory of Dynamical Mean Field and Spin Fluctuations

Cited by in corpus (3)

• Dynamical Mean Field Theory extension to the nonequilibrium Two-Particle Self-Consistent approach
• Two-Particle-Self-Consistent Approach for the Hubbard Model
• Iterative Perturbation Theory for Strongly Correlated Electron Systems with Orbital Degeneracy