Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.99: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Domain Walls in the Hubbard model — •Rolf Helmes, Luis Craco, and Achim Rosch — Institut für Theoretische Physik, Universität zu Köln, D-50937 Cologne, Germany

Phase separation and the physics of domain walls control the properties of many correlated systems with competing ground states, ranging from the manganites to organic Mott insulators [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. We use a generalization of dynamical mean field theory (DMFT) to treat inhomogeneous correlated systems such as domain walls of Mott insulators.

[1] Sasaki et al., Phys. Rev. Lett. 92, 227001 (2004)