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TT: Fachverband Tiefe Temperaturen

TT 43: Correlated Electrons: Metal-Insulator Transition 2

TT 43.9: Vortrag

Donnerstag, 29. März 2012, 17:15–17:30, H 3010

An efficient treatment of the high-frequency tail of the self-energy function and its relevance for multi-orbital models — •Gang Li and Werner Hanke — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany

An efficient and stable method is presented to determine the one-particle Green’s function in the hybridization-expansion continuous-time (CT-HYB) Quantum Monte Carlo method, within the framework of dynamical mean-field theory. The high-frequency tail of the impurity self-energy is replaced by a noise-free function determined by a dual-expansion around the atomic limit. This scheme essentially does not depend on the explicit form of the interaction term and does not introduce additional numerical cost to the runtime simulation. As an application, a 2-orbital Anderson impurity model with a general on-site interaction form is studied. The phase diagram is extracted as a function of the Coulomb interactions for a varity of Hund’s coupling strengths.