Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Quantum Impurities, Kondo Physics
TT 11.7: Vortrag
Dienstag, 27. März 2007, 11:15–11:30, H19
The Kondo model in nonequilibrium: Decoherence, current, and noise — Thomas Korb1, •Frank Reininghaus1, Herbert Schoeller1, and Jürgen König2 — 1Institut für Theoretische Physik A, RWTH Aachen, 52056 Aachen, Germany — 2Institut für Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
We study the Kondo effect in nonequilibrium using the real-time renormalization group [1] and put special emphasis on the calculation of the decoherence rate Γ. We obtain expressions for the current and the finite-frequency noise which are valid for voltages V ≫ TK. While the decoherence rate cannot be detected by measuring the current in a two-terminal setup, which was calculated previously using other methods [2,3], we demonstrate that the frequency dependence of the noise has features which allow the identification of Γ.
[1] H. Schoeller and J. König, Phys. Rev. Lett. 84, 3686
(2000)
[2] A. Rosch et al., Phys. Rev. Lett. 90, 076804
(2003)
[3] S. Kehrein, Phys. Rev. Lett. 95, 056602 (2005)