Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster: Atomic systems in external fields

A 26.16: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Nonequilibrium Green's functions approach to the pair distribution function of quantum many-body systems — •Kay Kobusch, Karsten Balzer, Lasse Rosenthal, Alexei Filinov, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Universität Kiel, D-24098 Germany

The pair distribution function (PDF) is a key quantity for analyzing correlation effects of quantum systems both in and far from equilibrium. We derive an expression for the PDF in terms of single particle Green's functions - the solutions of the Keldysh-Kadanoff-Baym equations in the two-time plane. The result includes initial correlations and generalizes previous density matrix expressions from single-time quantum kinetic theory. As an illustration we present numerical results for the PDF of electrons and holes in a strongly correlated electron-hole bilayer. These are calculated in different many-body approximations and then compared with Path integral Monte Carlo results.