Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.18: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

From periodic to dilute Anderson models: evolution of scales — •Lucas Hollender, Andrew Mitchell, and Ralf Bulla — Institut für theoretische Physik, Köln, Deutschland

The periodic Anderson model shows a characteristic energy scale below which the magnetic moments are coherently screened by conduction electrons. We examine within DMFT the behavior of this coherence scale as the number of magnetic impurities is reduced. First, we consider periodic systems comprising inequivalent impurity sublattices, and find a subtle interplay between sublattice scales. Dilute impurity behavior is then obtained on decoupling sublattices completely. Finally, we develop an inhomogeneous DMFT approach to study the extreme non-periodic limit of a few randomly distributed impurities, where single-impurity physics can dominate. The simplest two-impurity system can also be solved directly with NRG, and provides a benchmark.