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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.89: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Dual-Fermion approach to Non-equilibrium strongly correlated problems — •Alexander Lieder, Christoph Jung, Sergej Brener, Alexander Chudnovskiy, and Alexander Lichtenstein — I. Institut für Theoretische Physik Universität Hamburg

We present a generalization of the recently developed Superperturbation solver for the Anderson impurity model for the non-equilibrium case. We show that the general dual perturbation theory can be formulated on the Keldysh contour. Starting from a reference Hamiltonian system, in which the time-dependent solution is found by exact diagonalization, we make a dual perturbation expansion in order to account for the relaxation effects from the fermionic bath. Test cases for closed as well as open quantum systems in a fermionic bath are presented.