Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.60: Poster

Wednesday, March 24, 2010, 14:00–18:00, Poster D1

Superperturbation solver for non-equilibrium — •Alexander Lieder, Sergej Brener, Alexander Chudnovskiy, Dmytro Grytskyy, Christoph Jung, and Alexander Lichtenstein — I. Institut für Theoretische Physik

We present a generalization of the recently developed Superperturbation solver for the Anderson impurity model for the non-equilibrium case. The idea is to solve a small reference system using exact diagonalization with its full time dependence on the Keldysh contour and to treat the neglected bath degrees of freedom perturbatively. The key point is to introduce new fermionic degrees of freedom via a Hubbard-Stratonovich transformation. In the space of these auxiliary fermions Wicks theorem is applicable and a perturbation theory with a renormalized interaction is possible.