Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 74: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 74.9: Talk

Wednesday, April 2, 2014, 17:15–17:30, BEY 81

Nonequilibrium evolution of the Kondo screening cloud — •Martin Nuss, Martin Ganahl, Hans Gerd Evertz, Enrico Arrigoni, and Wolfgang von der Linden — Institute of Theoretical and Computational Physics, Graz University of Technology

Quantum impurity models feature nonperturbative physics at low temperatures, manifest in the Kondo effect. In equilibrium, the Kondo effect is accompanied by a diverging length scale for increasing interaction strength. While elusive in experiment this "Kondo length" has been observed in the spin-spin correlation functions in theoretical work. We extend these studies to the nonequilibrium regime by studying the interacting single impurity Anderson model after a quantum quench. Making use of Density Matrix Renormalization Group techniques, we present high accuracy numerical results for time dependent correlation functions and discuss the spatio-temporal evolution of the Kondo cloud. We furthermore present results for a system under bias, its temporal evolution as well as steady state characteristics [1].
Phys. Rev. B 88, 045132 (2013)