Ward identities for disordered metals and superconductors

Abstract

This article 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 new form that allows easy analysis of the quasiparticle charge conservation (as e.g. in a normal metal) or non-conservation (as e.g. in a d-wave superconductor).

Discussion of decoherence at T=0 removed

References in corpus (2)

• Disordered Dirac Fermions: the Marriage of Three Different Approaches
• Absence of electron dephasing at zero temperature

Cited by in corpus (1)

• Static transport properties of random alloys: vertex corrections in conserving approximations