Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 19: CE: Quantum Impurities, Kondo Physics

TT 19.3: Talk

Monday, March 14, 2011, 19:15–19:30, HSZ 304

RG analysis of a Spin-1 Kondo dot out of equilibrium — •Christoph Hörig, Sabine Andergassen, and Dirk Schuricht — RWTH Aachen, Germany

We study the spin-1 Kondo dot in a magnetic field and at finite bias voltage by using the real-time renormalization group in frequency space [1].

Based on a systematic expansion in the reservoir-system coupling, we integrate out the reservoir degrees of freedom and solve the resulting two-loop RG equations in the weak-coupling regime. We derive analytic expressions for the dot magnetization and for the current through the dot in the stationary state. We show that any initial spin anisotropy is strongly enhanced by renormalization effects.

Furthermore, we determine the relaxation and decoherence rates governing the time evolution into the stationary state, where an additional rate with respect to the spin-1/2 case emerges [2].
H. Schoeller, Eur. Phys. J. Special Topics 168, 179 (2009).
H. Schoeller and F. Reininghaus, Phys. Rev. B 80, 045117 (2009).