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APS

The modified perturbation treatment of the single impurity Anderson model and its application in dynamical mean-field theory.

Claas Grenzebach, G. Czycholl

Published Mar 1, 2003• 0 citations
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We discuss the "exhaustion" problem in the context of the pe rio dic Anderson model using iterated perturbation theory (IPT) within the dynamical mean-field theory. We find that, despite its limitations, IPT captures the exhaustion physics, which manifests itself as a dramatic, strongly energy-dependent, suppression of the effective hybridization of the self-consistent Anderson impurity problem. As a consequence, low-energy scales in the lattice case are strongly suppressed compared to the "Kondo scale" in the single impurity picture. The IPT results are in qualitative agreement with recent Quantum Monte Carlo results for the same problem.