Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3
TT 35.7: Vortrag
Donnerstag, 28. Februar 2008, 15:45–16:00, H 3010
Novel iterative path-integral scheme for interacting quantum dots out of equilibrium — •Stephan Weiss, Jens Eckel, Michael Thorwart, and Reinhold Egger — Inst. f. Theoret. Physik IV, Heinrich-Heine Universität Düsseldorf
We have developed a novel numerically exact method to evaluate fermionic many-body path-integrals. This method (IPI), see also [1] allows to give benchmark results for the observables of interest, e.g. the current. We perform simulations for real-time path-integrals on the Keldysh contour in a non-equilibrium situation. As application, we focus on the single site Anderson impurity model, subject to an applied bias voltage. We calculate the steady state current as a function of various system parameters, such as gate voltage є0, temperature T, on-dot Coulomb interaction U and external magnetic field B. Furthermore we obtain the nonlinear differential conductance in the coherent tunneling regime as a function of these parameters.
[1] S. Weiss, J. Eckel, M. Thorwart, and R. Egger, submitted.