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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.55: Poster

Wednesday, March 24, 2010, 14:00–18:00, Poster D1

Non-equilibrium magnetization dynamics of ferromagnetically coupled Kondo spins — •Andreas Hackl1, Matthias Vojta1, Stefan Kehrein2, Walter Hofstetter3, and David Roosen31Universität zu Köln — 2Universität München (LMU) — 3Universität Frankfurt

An analytical description of non-equilibrium phenomena in interacting quantum systems is rarely possible. Here we present one example where such a description can be achieved, namely the ferromagnetic Kondo model. In equilibrium, this model is tractable via perturbative renormalization-group techniques. We employ a recently developed extension of the flow-equation method to calculate the non-equilibrium decay of the local magnetization at zero temperature. The flow equations admit analytical solutions which become exact at short and long times, in the latter case revealing that the system always retains a memory of its initial state.

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