Real-Time Kadanoff-Baym Approach to Plasma Oscillations in a Correlated Electron Gas
- 21 February 2000
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 84 (8) , 1768-1771
- https://doi.org/10.1103/physrevlett.84.1768
Abstract
A nonequilibrium Green's functions approach to the collective response of correlated Coulomb systems at finite temperatures is presented. It is shown that solving Kadanoff-Baym-type equations of motion for the two-time correlation functions including the external perturbing field allows one to compute the plasmon spectrum with collision effects in a systematic and consistent way. The scheme has a “built-in” sum-rule preservation and is simpler to implement numerically than the equivalent equilibrium approach based on the Bethe-Salpeter equation.Keywords
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