Flow equation method for the non-equilibrium Anderson impurity model

Michael Moeckel

Ludwig-Maximilians-Universitaet Muenchen

The Anderson impurity model is of central importance in correlated electron physics and is often used as a minimal model for studying quantum dots with Coulomb blockade effects. Steady state non-equilibrium behaviour can be obtained by applying a constant voltage bias across the impurity site. We examine this steady state by means of the flow equation method at zero temperature in the regime of weak to medium correlation strength. In particular, we study the impurity orbital density of states and the decay of the quasi-particle resonance far away from equilibrium due to current-induced decoherence.