Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.11: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Mean-Field Theory of the Time-Dependent Kondo Effect — •Mohammad Sayad and Michael Potthoff — I. Institut für Theoretische Physik, University of Hamburg, Germany

We propose a generalization of the hybridization mean-field theory [1,2] to Kondo systems far from thermal equilibrium. This time-dependent mean-field approach is used to study the formation or breaking of a Kondo singlet on the time axis. To this end we consider a Kondo impurity on a one-dimensional tight-binding chain as well as on two- and three-dimensional clusters after a sudden change of the exchange-coupling strength. We present results for the ground-state and the finite-temperature equilibrium phase diagram of the Kondo Hamiltonian and for the non-equilibrium final-state dynamics after a quench through the phase boundary and discuss the time-dependent competition of the Kondo effect with the RKKY interaction for systems with two magnetic impurities.
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