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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.41: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Correlation effects in the two-site Anderson model (TIAM) — •Torben Jabben — TU-Darmstadt, Darmstadt, Hessen

Within the framework of the enhanced non-crossing approximation (ENCA), an approximative solution of the TIAM is obtained, which is applicable to any finite value of the Coulomb repulsion U.

One-particle spectra and thermodynamic properties are presented and discussed. Especially the competition between two independent Kondo effects at each impurity and the non-local singlet or triplet formation between both impurities is discussed.