Berlin 2015 – wissenschaftliches Programm
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 px-py symmetry. A variation of the underlying Fermi surface leads to features like Pomerantchuk instabilities or a change of the Fermi surface topology.