Hannover 2013 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 59: Quantum gases: Optical lattices III

Q 59.6: Talk

Friday, March 22, 2013, 12:15–12:30, F 342

Monte-Carlo simulation of frustrated magnetic phases of ultracold bosonic atoms in an optical lattice — •Robert Höppner and Ludwig Mathey — Zentrum für Optische Quantentechnologien/Institut für Laser-Physik, Hamburg, Germany

Recent experiments have demonstrated that ultracold Rubidium-87 atoms in frustrated optical lattices can be used to simulate classical magnetism (1). Here, we use classical Monte-Carlo to understand the equilibrium phase diagram of such systems. We consider a frustrated triangular lattice in which the tunnelling energy in two spatial directions is negative, and is complex in the third spatial direction. We model the bosonic field by using a thermally fluctuating complex field. We obtain several observables, such as the momentum space distribution of the atoms, both above and below the critical point, and the chirality of the state. We discuss the relevance of our results to experiments.

[1] Struck, J., et al. (2011). Quantum simulation of frustrated classical magnetism in triangular optical lattices. Science, 333 (6045)