Berlin 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: (General) Theory 1
TT 10.10: Vortrag
Montag, 26. März 2012, 17:30–17:45, H 3010
Pomeranchuk and pairing instabilities in two-dimensional Hubbard models — •Jörg Bünemann1, Tobias Schickling2, and Florian Gebhard2 — 1Institut für Physik, BTU Cottbus, D-03013 Cottbus, Germany — 2Fachbereich Physik, Philipps Universität Marburg, D-35032 Marburg, Germany
We have developed a diagrammatic method which permits the analytical evaluation of Gutzwiller wave functions in finite dimensions [1]. Unlike numerical schemes for the evaluation of such wave functions, our approach does not suffer from significant finite-size limitations and it can be readily generalised for the study of multi-band models. In our presentation we will introduce the main ideas of our approach and show results on single-band Hubbard models in two dimensions. In particular, we shall discuss the correlation-induced deformation of Fermi surfaces and the stability of phases with broken symmetry (``Pomeranchuk instabilities'' and superconducting order).
[1] J. Bünemann, T. Schickling, F. Gebhard, arXiv:1108.4284