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TT: Fachverband Tiefe Temperaturen

TT 46: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 46.8: Talk

Friday, March 27, 2009, 12:15–12:30, HSZ 301

Dynamical spin-spin correlation functions in the Kondo model out of equilibrium — •Dirk Schuricht and Herbert Schoeller — Institut fuer Theoretische Physik A, RWTH Aachen

We calculate the dynamical correlation function of a Kondo spin coupled to two noninteracting leads held at different chemical potentials. We use real-time renormalization group in frequency space up to 2-loop. The formalism includes the renormalization of the vertices and the Liouvillian determining the dynamics of the reduced density matrix of the local spin. As a result the cutoff by relaxation/dephasing rates, temperature, external frequency, Laplace variable of the time dynamics, and the voltage can be described on a microscopic level. We show show how nonequilibrium correlation function in real-frequency space can be calculated in Matsubara space without the need of any analytical continuation.