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TT: Fachverband Tiefe Temperaturen

TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena

TT 6.9: Poster

Montag, 23. März 2009, 13:00–16:45, P1A

Thermodynamics and transport properties of the single-band Hubbard model — •Ken Lichtner and Wolfgang Nolting — Institut für Physik, Humboldt-Universität, Newtonstraße 15, 12489 Berlin, Germany

We study the possibility and stability of band-ferromagnetism in the single-band Hubbard model, focusing on thermodynamics as well as transport properties calculated fully self-consistently within our local modified perturbation theory. The obtained self energy fulfills the first four spectral moments, therewith guaranteeing the correct high-energy behaviour, and is exact up to second order perturbation theory. Results are presented for f.c.c. as well as s.c. lattices. Phase diagrams are shown for ferromagnetic and paramagnetic solutions presented in terms of finite T and n. An overall comparison with the dynamical mean-field theory for infinite-dimensional lattices (DMFT) and the simple mean field theory (Stoner) is drawn.