Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 4: CE: Quantum Impurities, Kondo Physics

TT 4.6: Talk

Monday, March 22, 2010, 11:45–12:00, H21

Non-equilibrium Scaling Properties of a Double Quantum Dot System: Comparison between Perturbative Renormalization Group and Flow Equation Approach — •Verena Koerting¹, Peter Fritsch², and Stefan Kehrein² — ¹Niels Bohr Institute, Universitetsparken 5, DK-2100 København Ø, Denmark — ²Physics Department, Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Ludwig-Maximilians-Universität, Theresienstrasse 37, 80333 Munich, Germany

Since the discovery of Kondo physics in quantum dots, its far-from-equilibrium properties have generated considerable theoretical interest. By now several new theoretical methods have analyzed the interesting interplay of non-equilibrium physics and correlation effects in this model.

In this talk the differences and commons between the flow equation method out of equilibrium [1] and the frequency-dependent poor man's scaling approach [2] will be presented. We will focus on the non-equilibrium properties of a double quantum dot system, which will turn out to be a particularly suitable testing ground while being experimentally interesting in its own right.

[1] S. Kehrein, PRL 95, 056602 (2007).

[2] A. Rosch, J. Paaske, J. Kroha, and P. Wölfle, PRL 90, 076804 (2003).