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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.18: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Dynamics of the Periodic Anderson Model: exhaustion effects and the interplay of scales — •Lucas Hollender, Andrew Mitchell, and Ralf Bulla — Institute of Theoretical Physics, University of Cologne, Zülpicherstr. 77 50937 Cologne, Germany

We are investigating the paramagnetic periodic Anderson model within the framework of dynamical mean field theory, using Wilson's numerical renormalization group approach to obtain the self energy of the effective impurity model. We examine the exhaustion scenario where the conduction band is progressively emptied. Here our main interest lies in the existence of the Kondo scale and its connection to the coherence scale. We also consider a bipartite system (with two sublattices comprising inequivalent impurity sites), and study the interplay of Kondo and lattice coherence scales. Furthermore we increase the distance of the impurities to simulate dilute impurity systems, trying to find the crossover from the lattice system to the dilute impurity system.