Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Correlated Electrons: Metal-Insulator Transition 2
TT 43.10: Vortrag
Donnerstag, 29. März 2012, 17:30–17:45, H 3010
Effective models for spin liquid phases in Hubbard models — Hong Yu Yang1, Fabrizio Albuquerque2, Sylvain Capponi2, Andreas Läuchli3, and •Kai Phillip Schmidt4 — 1Institut de théorie des phénomènes physiques, EPF Lausanne, 1015 Lausanne, Switzerland — 2Laboratoire de Physique Théorique, IRSAMC, Université Paul Sabatier, 31062 Toulouse Cedex 04, France — 3Institut für Theoretische Physik, Universität Innsbruck, 6020 Innsbruck, Austria — 4Lehrstuhl für Theoretische Physik I, TU Dortmund, Germany
The Hubbard model is one of the most studied microscopic models in condensed matter physics. It describes on a very simple level the interplay between the kinetics and the Coulomb interaction of electrons in solid state systems. Generically, one expects at half filling a metallic phase for large kinetics while a Mott insulator is present for large interactions. In recent years more and more evidences have been found that especially on frustrated lattices there is the possibility of exotic and insulating intermediate phases without long-range order. It is therefore an obviously relevant question what kind of effective low-energy theory describes such Mott phases and how to derive them. This is particular complicated when the spin liquid is located close to the metal-insulator transition as for the recently discovered spin liquid of the Hubbard model on the honeycomb lattice. In this talk we discuss these issues for the Mott phase of the Hubbard model on the triangular and on the honeycomb lattice.