Anderson Model in a Superconductor: $\Phi$-Derivable Theory

Abstract

We introduce a new $\Phi$-derivable approach for the Anderson impurity model in a BCS superconductor. The regime of validity of this conserving theory extends well beyond that of the Hartree-Fock approximation. This is the first generalization of the U-perturbation theory to encompass a superconductor.

11 pages and 4 figures. Accepted for publication in Journal of Physics: Condensed Matter as a Letter to the Editor

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