Real-time Kadanoff-Baym approach to plasma oscillations in a correlated electron gas

Details Real-time Kadanoff-Baym approach to plasma oscillations in a correlated electron gas Real-time Kadanoff-Baym approach to plasma oscillations in a correlated electron gas

1999-12-03

arxiv.org/abs/cond-mat/9912053v1

Phys.Rev.Lett.84:1768-1771,2000

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages two-column RevTeX, 6 figures including 4 diagrams included in text, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.1768

A nonequilibrium Green's functions approach to the collective response of correlated Coulomb systems at finite temperature is presented. It is shown that solving Kadanoff-Baym type equations of motion for the two-time correlation functions with the external perturbing field included allows to compute the plasmon spectrum with collision effects in a systematic and consistent way. The scheme has ``built-in'' sum rule preservation and is simpler to implement numerically than the equivalent equilibrium approach based on the Bethe-Salpeter equation.

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