Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Metal-Insulator Transition 1
TT 28.2: Vortrag
Donnerstag, 28. Februar 2008, 09:45–10:00, H 2053
Hubbard Model on the Bethe lattice with next-nearest neighbor hopping — •Robert Peters and Thomas Pruschke — Friedrich-Hund-Platz 1, 37077 Göttingen
We investigated the Bethe lattice with nearest-neighbor and next-nearest neighbor hopping t1 and t2 within dynamical mean-field theory using Wilson’s numerical renormalization group as impurity solver. We study this model for various values of t2 including t2=t1 and t2<0. We especially discuss the interplay between antiferromagnetism and the paramagnetic metal-insulator-transition at half-filling. For the doped model the existence of ferromagnetism depending on the value of U is analyzed.