Real-time Kadanoff-Baym approach to plasma oscillations in a correlated electron gas
Abstract
Description
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.
4 pages two-column RevTeX, 6 figures including 4 diagrams included in text, submitted to Phys. Rev. Lett
4 pages two-column RevTeX, 6 figures including 4 diagrams included in text, submitted to Phys. Rev. Lett