Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.6: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

A fast impurity solver based on merging the equation of motion method and genetic algorithms — •Qingguo Feng, Yuzhong Zhang, and Harald O. Jeschke — Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany

The successful application of LDA+DMFT to strongly correlated systems generates increasing interest in the development of fast impurity solvers for DMFT. By using the equation of motion method with a suitable decoupling scheme, a new fast impurity solver is established. An efficient way to find self-consistent solutions of the closed set of integral equations is found in a combination of iteration and genetic algorithms. This new impurity solver can work directly on the real frequency axis and yields the Green’s function for all temperatures. The successful description of various physical properties of Hubbard and periodic Anderson models demonstrates the power of our method in understanding strongly correlated systems.