Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.75: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Variational Cluster Approximation for broken symmetry phases in strongly correlated electron systems — •Benjamin Lenz, Piet Dargel, and Thomas Pruschke — Institut für theoretische Physik, Georg-August-Universität, 37077 Göttingen, Germany

The variational cluster approximation (VCA) allows to study broken symmetry phases of various lattice models at zero temperature. We present results for s-type superconductivity of the attractive two-dimensional Hubbard model in the infinite-cluster size limit of VCA. They are discussed in comparison to results from dynamical mean-field theory in combination with the numerical renormalization group method. As a second example, we give an outlook to the investigation of antiferromagnetism and superconductivity in a paradigmatic model for heavy fermions – the Kondo lattice model.