Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.55: Poster
Mittwoch, 24. März 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 Roosen3 — 1Universität 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.