Equivalence of channel-corrected T-matrix and anomalous propagator approach

Details Equivalence of channel-corrected T-matrix and anomalous propagator approach Equivalence of channel-corrected T-matrix and anomalous propagator approach

2009-11-09

arxiv.org/abs/0911.1725v2

Physical Review B 82, 092501 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, misprints corrected

Scientific paper

10.1103/PhysRevB.82.092501

Any many-body approximation corrected for unphysical repeated collisions in a given condensation channel is shown to provide the same set of equations as they appear by using anomalous propagators. The ad-hoc assumption in the latter theory about non-conservation of particle numbers can be released. In this way the widespread used anomalous propagator approach is given another physical interpretation. A generalized Soven equation follows which improves any approximation in the same way as the coherent potential approximation (CPA) improves the averaged T-matrix for impurity scattering.

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