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TT: Fachverband Tiefe Temperaturen

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

TT 18.9: Talk

Tuesday, March 27, 2012, 11:45–12:00, H 3005

Kondo correlations in a disordered medium — •Michael Becker, Andrew Mitchell, and Ralf Bulla — Institut für theoretische Physik, Universität zu Köln

The Kondo effect is a classic paradigm, describing the formation of a many-body spin-singlet state between a local magnetic impurity and delocalized conduction electrons at low temperatures. However, in disordered systems, localization physics plays a key role. Here we consider the subtle interplay between Kondo physics and Anderson localization in disordered 1D and quasi 2D and 3D systems which contain a single correlated impurity site. Equations of motion and exact diagonalization are used to calculate hybridization functions for the non-interacting system, which constitute the input for NRG calculations in the interacting case. Real-space quantities are then extracted for the full system, and provide information on the Kondo screening length and localization length, whose relative magnitudes dictate the underlying physics.