DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2006 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.29: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

Collective spin excitations within the time-dependent Gutzwiller approximation for the Hubbard model — •Falk Günther and Götz Seibold — BTU Cottbus

We use a spin-rotational invariant slave-boson-formulation of the Hubbard model, in order to investigate the collective excitations of itinerant ferromagnets. The expansion of the resulting spin-rotational invariant Gutzwiller energy functional around the saddle point allows the computation of dynamic correlation functions using the random-phase approximation (RPA). We evaluate ferromagnetic and antiferromagnetic instabilities from the transverse magnetic susceptibility and compute the dispersion relation for the spin waves. Results for one- and two-dimensional systems are presented and compared with the convetional Hartree-Fock+RPA theory.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2006 > Dresden