Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Symposium “Condensed Matter Phases in Ultracold Atoms”

TT 24.4: Vortrag

Donnerstag, 29. März 2007, 11:10–11:35, H20

Simulations of ultra-cold atom gases on frustrated optical lattices — •Stefan Wessel — Institut für Theoretische Physik III, Universität Stuttgart

We review results from recent quantum Monte Carlo simulations of ultra-cold bosonic atoms on frustrated optical lattices such as the triangular and the Kagome lattice. For the triangular lattice case a supersolid state of matter emerges, resulting from a novel order-by-disorder effect in the strongly interacting regime. On the Kagome lattice the atoms form exotic valence-bond-solids with local bosonic resonances. We discuss the quantum melting transitions of these solids, the connection to the recently proposed deconfined quantum criticality scenario, as well as the relation to frustrated quantum magnetism.