Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Correlated Electrons: Quantum Impurities, Kondo Physics 2

TT 18.7: Vortrag

Dienstag, 27. März 2012, 11:15–11:30, H 3005

Nonequilibrium Kondo model: the RG flow from weak to strong coupling — •Mikhail Pletyukhov and Herbert Schoeller — Institut für Theorie der statistischen Physik, RWTH Aachen, Physikzentrum, D - 52074 Aachen

A renormalization group flow of the nonequilibrium Kondo model from high energies (weak coupling) to low energies (strong coupling) is discussed. A new flowing scheme (E-flow) within the Real Time Renormalization Group (RTRG) approach which uses the Laplace variable E as a flow parameter is introduced. The accuracy of this scheme in equilibrium is checked via the comparison against the benchmark NRG calculation of the linear conductance at finite temperatures. In nonequilibrium, the new results for the voltage dependence of the differential conductance are presented.

Another remarkable feature of the E-flow scheme is that it provides an access to the full time dynamics of a system, once the corresponding flow equations have been integrated. An application of the E-flow scheme to the study of time evolution of the Kondo model in the strong coupling regime is discussed.