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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.26: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Ionic Hubbard Model in High Dimension — •Krunoslav Pozgajcic and Claudius Gros — Universität des Saarlandes, Fakultät 7, Theoretische Physik, Postfach 15 11 50, D-66041 Saarbrücken

Ionic Hubbard model was proposed for the description of organic mixed-stack charge-transfer crystals and also for the description of the ferroelectric transition in perovskite materials. Theoretical efforts have mostly been directed to the one dimensional case, which has be thoroughly investigated by various methods on disposal for the one dimensional systems. Recently, the self-energy functional approximation (SFA) has been proposed (M. Potthoff, Eur. Phys. J. B 32, 429(2003)) as a unifying scheme for a few cluster methods. We will present results for the one dimensional and the higher dimensional ionic Hubbard model calculated in the SFA framework.