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Paper detail

Nonequilibrium Green's function approach to the pair distribution function of quantum many-body systems out of equilibrium

The pair distribution function (PDF) is a key quantity for the analysis of correlation effects of a quantum system both in equilibrium and far from equilibrium. We derive an expression for the PDF in terms of the single-particle Green's functions---the solutions of the Keldysh/Kadanoff-Baym equations in the two-time plane---for a one- or two-component system. The result includes initial correlations and generalizes previous density matrix expressions from single-time quantum kinetic theory. Explicit expressions for the PDF are obtained in second Born approximation.

preprint2012arXivOpen access
M. BonitzS. HermannsK. KobuschK. Balzer
cond-mat.str-el
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M. BonitzS. HermannsK. KobuschK. Balzer

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