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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

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[1]. 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 [2] for Hubbard systems in arbitrary dimensions in nonequilibrium.

[1] Kajala et al., Phys.Rev.Lett. 106 206401 (2011).

[2] Hermanns et al., Phys.Rev. B 90 125111 (2014).