Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.12: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Spectral Functions for Strongly Correlated Multi-Orbital Systems with full Coulomb Vertex — •German Ulm¹ and Alexander I. Lichtenstein² — ¹German Research School for Simulation Sciences and RWTH Aachen University, 52425 Jülich — ²1. Institut für Theoretische Physik, Universität Hamburg

We present an efficient approach for calculating dynamical properties of solids with strong electron correlations. The fast cluster method, a finite temperature Lanczos method, is combined with Dynamical Mean-Field Theory (DMFT) in order to study orbital degenerate systems as function of temperature. The full local Coulomb interaction is taken into account in all calculations. We analyze different double-counting correction schemes for systems with strong electron correlations. We show results of an extensive study of the charge transfer system NiO in the LDA+DMFT framework using quantum Monte Carlo and finite-temperature Lanczos impurity solvers.