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TT: Tiefe Temperaturen

TT 14: Systeme korrelierter Elektronen: Theorie II

TT 14.1: Talk

Wednesday, March 13, 2002, 14:30–14:45, H19

Exact mapping of periodic Anderson model to Kondo lattice model — •P. Sinjukow and W. Nolting — Lehrstuhl Festkörpertheorie, Institut für Physik, Humboldt-Universität zu Berlin, Invalidenstr. 110, 10115 Berlin

We show that the Kondo lattice model can be rigorously obtained for any finite coupling constant J from the periodic Anderson model in a special limit (extended Kondo limit). The mapping goes beyond the well-known equivalence between the weak-coupling limit (J→ 0) and the conventional Kondo limit of the two models. It implies a direct proof of the “large” Fermi volume for a nonmagnetic Fermi-liquid state of the Kondo lattice model, which confirms in a much simpler way the result of a recent topological proof by Oshikawa [Phys. Rev. Lett. 84, 3370 (2000)]. Based on the mapping, any analytical and computational method of the periodic Anderson model, e.g. dynamical mean-field theory, can be directly applied to the Kondo lattice model.