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TT: Fachverband Tiefe Temperaturen

TT 11: Quantum Impurities, Kondo Physics

TT 11.7: Talk

Tuesday, March 27, 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 ≫ T_K. 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)