Non-equilibrium magnetization dynamics of ferromagnetically coupled Kondo spins

Details Non-equilibrium magnetization dynamics of ferromagnetically coupled Kondo spins Non-equilibrium magnetization dynamics of ferromagnetically coupled Kondo spins

2009-08-25

arxiv.org/abs/0908.3647v1

Phys. Rev. B 80, 195117 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 7 figures

Scientific paper

10.1103/PhysRevB.80.195117

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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