Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.6: Poster

Mittwoch, 27. Februar 2008, 14:00–18:00, Poster B

An iterative real-time path integral method for an Anderson dot with metallic leads — •Jens Eckel, Stephan Weiss, Michael Thorwart, and Reinhold Egger — Institut für Theoretische Physik IV, Heinrich-Heine-Universität Düsseldorf

We present a newly developed method based on an iterative non-equilibrium real-time path integral approach, which is numerically exact since no perturbative approximations are involved [1]. The convergence procedure [2] allowing to eliminate the discretization errors within the method (e.g., (i) a finite memory length of the lead correlator and the interaction self-energy, and (ii) a discretization error due to a Trotter breakup) is illustrated in detail and physically motivated to show the universal validity of the method. The method is applied to a single level Anderson dot attached to metallic leads, where we take into account a finite bias voltage as well as an external magnetic field. The full dI/dV characteristics is computed numerically exact without any perturbative limitation for various experimentally relevant parameters, e.g., the gate voltage and the temperature of the system.

[1] S. Weiss, J. Eckel, M. Thorwart, and R. Egger, submitted.

[2] J. Eckel, S. Weiss, and M. Thorwart, Eur. Phys. J. B 53, 91-98 (2006).