Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.82: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Quasiparticle bands of the ionic hubbard model — •Torben Jabben and Norbert Grewe — Institut für Festkörperphysik, Tu-Darmstadt,D-64289 Darmstadt

The ionic Hubbard model on a simple cubic lattice is investigated using analytical approximations and Wilson’s renormalization group for the charge excitation spectrum near the Mott insulating regime. The corresponding partial spectral weights and local densities of states show characteristic features, which compare well with a hybridized-band picture appropriate for the regime at small U, which at half-filling is known as a band insulator. In particular, a narrow charge gap is obtained at half-filling in the ABR, and the distribution of spectral quasi-particle weight reflects the fundamental hybridization mechanism of the model.