Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.62: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Metal-to-insulator transitions in the two-plane Hubbard model — •David Heilmann — (dann:) Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich — (noch:) Phys. Institut der Universität Bonn, Nussallee 12, 53115 Bonn

The question if a Mott insulator and a band insulator are fundamentally different has been the matter of intensive research recently. Here we consider a simple model which allows by tuning one parameter to go continously from a Mott insulator to band insulator. The model consists of two Hubbard systems connected by single particle hopping. The Hubbard Hamiltonian is solved by the Dynamical Mean-Field theory using Quantum Monte Carlo. The quasiparticle spectral function, the opticall conductivity and the self-energy is calculated. Here we particularly focus on the Drude weight.