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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.46: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Modified Fermi-liquid behavior of the Hubbard model at finite temperature within the dynamical mean-field theory — •Sebastian Schmitt — Lehrstuhl für Theoretische Physik II, Technische Universität Dortmund, Otto-Hahn-Str. 4, 44221 Dortmund

The one-particle Green function of the Hubbard model is calculated within the dynamical mean field theory (DMFT) for various non-interacting density of states (DOS). The Fermi-liquid ground state usually observed within the DMFT reveals itself through the characteristic quadratic minimum in the imaginary part of the self-energy which develops already at finite temperature. In situations where the non-interacting DOS features van-Hove singularities in the vicinity of the Fermi level, this minimum at finite temperature is strongly modified and may even transform into a maximum. The presented findings are discussed in connection with non-Fermi liquid and pseudogap behavior usually encountered in non-local extensions of the DMFT.