On Perturbation Theory Around the Atomic Limit of Strongly Correlated Electron Systems: A New Approach Based on Wick's Theorem

Abstract

A new perturbational approach to spectral and thermal properties of strongly correlated electron systems is presented: The Anderson model is reexamined for $U\to \infty$\,, and it is shown that an expansion of Green's functions with respect to the hybridization $V$ built on Feynman diagrams obeying standard rules is possible. The local correlations of the unperturbed system (the atomic limit) are included exactly through a two-particle vertex. No auxiliary particles are introduced into the theory. As an example and test the small energy scale and many-body resonance of the Kondo problem are reproduced analytically.

To be presented at SCES'94, Amsterdam. Postscript file (5 pages) including 3 figures; ordinary latex-file plus postscript-figures available upon request (gnmlphgfrt)

References in corpus (1)

• Wick's Theorem and a New Perturbation Theory Around the Atomic Limit of Strongly Correlated Electron Systems

Cited by in corpus (1)

• Self-Consistent Strong-Coupling-Perturbation Theory for the Anderson Model, Based on Wicks Theorem