Real-Time Kadanoff-Baym Approach to Plasma Oscillations in a Correlated Electron Gas

N.-H. Kwong; M. Bonitz

doi:10.1103/PhysRevLett.84.1768

Real-Time Kadanoff-Baym Approach to Plasma Oscillations in a Correlated Electron Gas

N.-H. Kwong and M. Bonitz

Phys. Rev. Lett. 84, 1768 – Published 21 February 2000

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.

Received 30 August 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.1768

Authors & Affiliations

N.-H. Kwong^* and M. Bonitz

Fachbereich Physik, Universität Rostock, Universitätsplatz 3, D-18051 Rostock, Germany

^*Present address: Cooperative Excitation Project, ERATO, Japan Sciences and Technology Corporation, Optical Sciences Center, University of Arizona, Tucson, Arizona 85721.