Berlin 2015 – wissenschaftliches Programm
TT 71.67: Poster
Mittwoch, 18. März 2015, 15:00–18:00, Poster B
Correlated lattice systems far from equilibrium—a nonequilibrium Green functions approach — •Sebastian Hermanns, Niclas Schlünzen, and Michael Bonitz — ITAP, Christian–Albrechts–Universität Kiel, Leibnizstr. 15, 24098 Kiel, Germany
The study of dynamical processes in lattice systems reveals a great variety of electronic phenomena which occur on an ultrafast time scale. They include the build-up of inter-particle correlation as well as dynamically screening of the interaction. To describe these processes theoretically, the framework of non-equilibrium Green functions is very well suited. It provides a controlled way to generate various classes of many-body approximations focussed on different aspects of the experiment. In this contribution, we analyze the specific features covered by the second order Born, GW and T-matrix approximation in combination with the Generalized Kadanoff-Baym ansatz  for Hubbard systems in arbitrary dimensions in nonequilibrium.
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