Ward identities for disordered metals and superconductors

Details Ward identities for disordered metals and superconductors Ward identities for disordered metals and superconductors

2002-08-01

arxiv.org/abs/cond-mat/0208030v2

Phys. Rev. B 66, 220503(R) (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Discussion of decoherence at T=0 removed

Scientific paper

10.1103/PhysRevB.66.220503

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).

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