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TT: Fachverband Tiefe Temperaturen

TT 86: Correlated Electrons: (General) Theory 2

TT 86.3: Vortrag

Donnerstag, 19. März 2015, 10:00–10:15, H 3005

Gutzwiller variational wave function for a two-orbital Hubbard model on a square lattice — •Kevin zu Münster — Philipps University, Marburg, Germany

Gutzwiller variational wave functions can be evaluated exactly in infinite dimensions by the introduction of a gauge in the variational parameters. We present the generalization of this method for multiorbital systems and its application to a finite-dimensional lattice. We show numerical results for a two-dimensional Hubbard model with p_x-p_y symmetry. A variation of the underlying Fermi surface leads to features like Pomerantchuk instabilities or a change of the Fermi surface topology.