Anderson Model in a Superconductor: Φ-Derivable Theory
classification
❄️ cond-mat.supr-con
cond-mat.str-el
keywords
superconductortheoryandersonderivablemodelapproachapproximationbeyond
read the original 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.
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