Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.46: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Projective renormalization approach (PRM) to the one-dimensional Hubbard model — •Christian Köhler, Steffen Sykora, and Klaus W. Becker — Institut für Theoretische Physik, TU Dresden, Germany

The usual method for the investigation of the low-energy properties of the one-dimensional Hubbard model with linear electron dispersion is based on the bosonization approach for the densities of the two electron branches. Instead of using a Bogoliubov transformation to diagonalize the bosonized Tomonaga-Luttinger Hamiltonian, in the PRM the interaction between the densities on the two branches is eliminated successively. As a result, one achieves a renormalized Hamiltonian with no coupling between the two branches. In this way, an improved evaluation for the Luttinger parameters can be obtained.