Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 41: CE: Low-dimensional Systems - Models 2
TT 41.1: Talk
Friday, March 26, 2010, 10:15–10:30, H21
Spatial Fluctuation effects on Orbital Selective Mott Transitions — •Hunpyo Lee1, Yu-Zhong Zhang1, Harald Jeschke1, Roser Valenti1, and Hartmut Monien2 — 1Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany — 2Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany
Orbital selective Mott transitions have been extensively studied on an anisotropic two-band Hubbard model in the framework of dynamical mean field theory with various impurity solvers. Effects of interband hybridization, spin flip and pair-hopping processes, anisotropy in the Hund’s rule coupling and bandwidth, crystal field splitting, and inclusion of more bands have been already addressed in the past. In the present work we investigate the role of spatial fluctuations. By considering the dynamical cluster approximation and employing the continuous time quantum Monte Carlo method, we obtain a rich phase diagram of the anisotropic two-band Hubbard within a 4-site cluster. We analyze the cluster size dependence of the phase diagram by also performing 2-site cluster calculations and discuss possible Slater versus Mott physics.