Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 28: Correlated Electrons: General Theory
TT 28.4: Vortrag
Donnerstag, 30. März 2006, 10:45–11:00, HSZ 301
Static and dynamic properties of the spinless Falicov-Kimball model — •Steffen Sykora1, Klaus W. Becker1, and Veliko Zlatic2 — 1Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany — 2Institute of Physics, Bijenika c. 46, P.O.B 304, 10000 Zagreb, Croatia
The spinless Falicov-Kimball model in one dimension is studied by use of a recently developed projector-based renormalization method (PRM) for many-particle Hamiltonians. The method is used to evaluate static and dynamic quantities of the system at half-filling. To these belong the quasiparticle excitation energy εk and the momentum distribution nk of the conduction electrons and spatial correlation functions of the localized electrons. One of the most remarkable results is the appearance of a gap in εk at the Fermi level of the order of the Coulomb repulsion U which is accompanied by a smooth behavior for nk. The density of states for the conduction electrons and the one-particle spectral functions for the localized electrons are also discussed. In both quantities a gap opens with increasing U.