Ward identities for disordered metals and superconductors
Revaz Ramazashvili
DOI 10.1103/PhysRevB.66.220503 · Physical Review B
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Abstract
This paper revisits Ward identities for disordered interacting normal metals and superconductors. It offers a simple derivation based on gauge invariance and recasts the identities in a form that allows easy analysis of the quasiparticle charge conservation (as, e.g., in a normal metal) or nonconservation (as, e.g., in a d-wave superconductor).
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