Analytic impurity solver with the Kondo strong-coupling asymptotics

Details Analytic impurity solver with the Kondo strong-coupling asymptotics Analytic impurity solver with the Kondo strong-coupling asymptotics

2006-07-03

arxiv.org/abs/cond-mat/0607052v2

Phys. Rev. B 75, 165108 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages REVTeX4, 5 EPS figures, extended version

Scientific paper

10.1103/PhysRevB.75.165108

We present an analytic universal impurity solver for strongly correlated electrons. We extend the many-body perturbation expansion via suitable two-particle renormalizations from the Fermi-liquid regime to the critical region of the metal-insulator transition. The reliability of the approximation in the strong-coupling limit is demonstrated by reproducing the Kondo scale in the single-impurity Anderson model. We disclose the origin of the Kondo resonance in terms of Feynman diagrams and find criteria for the existence of the proper Kondo asymptotic behavior in approximate theories.

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