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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.83: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Phase transition in the Hubbard-Holstein model with infinitely large Coulomb repulsion — •Andreas Eberlein, Steffen Sykora, and Klaus W. Becker — Institut für Theoretische Physik, TU Dresden, Germany

The one-dimensional Hubbard-Holstein model is studied in the limit of infinitely large on-site Coulomb repulsion. By using the projector-based renormalization method (PRM), the electron-phonon interaction (∼ g) is successively eliminated and an uncoupled system of renormalized correlated electrons and phonons is obtained. As a result, for the case of quarter filling a phase transition from a Luttinger liquid at small g to a charge-ordered state (CDW) at large g is expected.