Heidelberg 1999 – wissenschaftliches Programm

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P: Plasmaphysik

P 16: Dichte Plasmen III

P 16.7: Vortrag

Donnerstag, 18. März 1999, 18:15–18:30, CH 2

New Selfconsistent Approach to Nonlinear Plasma Oscillations in Correlated Plasmas — •Michael Bonitz, Dirk Semkat, and Nai-Hang Kwong — Universit"at Rostock, Fachbereich Physik, D-18051 Rostock

Inspired by the semiconductor Bloch equations, we present an extension of the underlying concept to more complicated systems. The Bloch equations allow for an efficient treatment of two-particle bound states (excitons etc.) in terms of one-particle quantities (Wigner distribution and interband polarizations). This picture is much simpler than the conventional two-particle description based on the Bethe-Salpether equation. We give a detailed comparison of the two approaches and discuss their respective advantages and limitations [1]. We demonstrate how the multi-band concept can be extended to the description of plasma oscillations, including nonlinear effects as well as the influence of correlations among the carriers, thereby “automatically” preserving consistency requirements, such as conservation laws and sum rules.

[1] M. Bonitz, N. Kwong, D. Semkat, and D. Kremp, Contr. Plasma Phys. (1999)

[2] N. Kwong, and M. Bonitz, submitted for publication