Electron Self-Energy and Generalized Drude Formula for Infrared Conductivity of Metals

Details Electron Self-Energy and Generalized Drude Formula for Infrared Conductivity of Metals Electron Self-Energy and Generalized Drude Formula for Infrared Conductivity of Metals

2004-07-29

arxiv.org/abs/cond-mat/0407777v1

Physics

Condensed Matter

Other Condensed Matter

3 pages

Scientific paper

Goetze and Woelfle (GW) wrote the conductivity in terms of a memory function M as (ine2/m)/(omega+M(omega)), where M=i/tau in the Drude limit. The analytic properties of -M are the same as those of the self-energy of a retarded Green's function. In the approximate treatment of GW, -M closely resembles a self-energy, with differences, e.g., the imaginary part is twice too large. The correct relation between -M and the self-energy is known for the electron-phonon case and is conjectured to be similar for other perturbations. When vertex corrections are ignored there is a known relation. A derivation using Matsubara temperature Green's functions is given.

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