Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.48: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Effective quantum dimer models for strongly correlated fermion systems — •Dominik Ixert and Kai Phillip Schmidt — Lehrstuhl für Theoretische Physik I, TU Dortmund, Germany

The Hubbard model is the standard model for the description of strongly correlated electron systems. Here we focus on single-band Hubbard models at zero temperature and at half filling. Recently, more and more evidences have been found for exotic insulating quantum spin liquid phases close to the metal-insulator transition. We are aiming at a microscopic description of these interesting non-magnetic phases in terms of effective quantum dimer models. To this end we apply graph-based continuous unitary transformations (gCUTs). It is expected that this approach works well as long as the charge and the spin gap is finite which is for example the case for the quantum spin liquid on the honeycomb lattice.