Titlebook: High Performance Computing in Science and Engineering ’01; Transactions of the Egon Krause,Willi J?ger Conference proceedings 2002 Springe

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Single Hole Dynamics in Correlated Insulators,s. Ground state properties on systems sizes up to 24 × 24 are computed numerically. Both models at a particular band filling are correlated insulators. Here, we concentrate on the dynamics of single hole doped into this state. For the . model we show that two-leg ladder systems can be well understoo

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Impurities in a Hubbard-chain,the effects of several kinds of impurities on the ground-state of a Hubbard chain in detail. Thereby we look at the transition from a metallic to an insulating ground-state caused by a local potential, a locally modified interaction or hopping. Unfortunately the preliminary results show that the suc

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HAWK

Conflagration

The Role of the Geometric Structure for Electronic Excitations of Molecules and Surfaces, . quasiparticle calculations, and the Bethe-Salpeter equation for coupled electronhole excited states. Results for three different materials are discussed: the optical spectrum of quartz, the optical response of the Ge(111)-(2×1) surface, and excited states of methane. The particular focus is on th

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