Phys. Rev. B 75, 165108 (2007) [7 pages]Analytic impurity solver with Kondo strong-coupling asymptoticsReceived 9 January 2007; published 11 April 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.165108
DOI:
10.1103/PhysRevB.75.165108
PACS:
72.15.Qm, 75.20.Hr
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