Evaluation of the optical conductivity tensor in terms of contour integrations
arXiv:cond-mat/0012174 · doi:10.1088/0953-8984/11/50/333
Abstract
For the case of finite life-time broadening the standard Kubo-formula for the optical conductivity tensor is rederived in terms of Green's functions by using contour integrations, whereby finite temperatures are accounted for by using the Fermi-Dirac distribution function. For zero life-time broadening, the present formalism is related to expressions well-known in the literature. Numerical aspects of how to calculate the corresponding contour integrals are also outlined.
8 pages, Latex + 2 figure (Encapsulated Postscript)
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