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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.61: Poster

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

Inhomogenous Hubbard model for solids and optical traps — •Rolf Helmes, Luis Craco, and Achim Rosch — Institute of Theoretical Physics, University of Cologne, Zülpicher Str. 77, 50937 Cologne

Inhomogenous systems described by the Hubbard model occur in several very interesting fields of physics: e.g., phase separation and the physcis of domain walls control the properties of manganites, see e.g. [1]. We therefore study domain walls between different phases of the Hubbard model. The interplay of domain walls and their energetics on the one hand and of long-range Coulomb interaction on the other hand, control for example the physics of phase-separation close to a first-order metal-insulator transition. Another example of an inhomogenous Hubbard-model system are fermions in an optical lattice. Here parameters can be tuned such that an "Mott-insulating onion shell" separates two metallic regions in a 3D-trap. We use a generalization of dynamical mean field theory (DMFT) to treat these inhomogeneous correlated systems.

[1] Cheong et al., Nature 2002, 416(6880),518-521