Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.71: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Magnetic susceptibility and spin-wave properties of two-band Hubbard models — •Ernst von Oelsen, Jörg Bünemann, and Götz Seibold — Institut für Physik, BTU Cottbus, Postfach 101334, 03013 Cottbus

We present result on the magnetic susceptibility and the spin-wave properties of two-band Hubbard models in two, three, and infinite dimensions. As a method we use the recently developed generalisation of the time-dependent Gutzwiller theory for multi-band models. Our findings are compared with those of a Hartree-Fock based random phase approximation, which is the standard textbook method for the calculation of two-particle response functions. Like in the corresponding ground-state theories we find significant differences between both methods quantitatively as well as qualitatively.