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    Université de Fribourg

    Double occupancy and magnetic susceptibility of the Anderson impurity model out of equilibrium

    Dirks, Andreas ; Schmitt, S. ; Han, J. E. ; Anders, F. ; Werner, Philipp ; Pruschke, Thomas

    In: EPL (Europhysics Letters), 2013, vol. 102, no. 3, p. 37011

    We use different numerical approaches to calculate the double occupancy and magnetic susceptibility as a function of a bias voltage in an Anderson impurity model. Specifically, we compare results from the Matsubara voltage quantum Monte Carlo approach (MV-QMC), the scattering states numerical renormalization group (SNRG), and real-time quantum Monte Carlo (RT-QMC), covering Coulomb repulsions...

    Université de Fribourg

    Extracting spectral properties from Keldysh Green functions

    Dirks, Andreas ; Eckstein, Martin ; Pruschke, Thomas ; Werner, Philipp

    In: Physical Review E, 2013, vol. 87, no. 2, p. 023305

    We investigate the possibility to assist the numerically ill-posed calculation of spectral properties of interacting quantum systems in thermal equilibrium by extending the imaginary-time simulation to a finite Schwinger-Keldysh contour. The effect of this extension is tested within the standard maximum entropy approach to analytic continuation. We find that the inclusion of real-time data...