Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum gases: Lattices II

Q 57.4: Vortrag

Freitag, 21. März 2014, 11:15–11:30, UDL HS2002

Superfluid - Mott transition in the presence of artificial gauge fields — •Ivana Vidanovic1, Alex Petrescu2, Karyn Le Hur3, and Walter Hofstetter11Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany — 2Department of Physics, Yale University, New Haven, USA — 3Centre de Physique Theorique, Ecole Polytechnique, CNRS, Palaiseau Cedex, France

Several recent cold atom experiments reported implementation of artificial gauge fields in optical lattice systems, paving the way toward observation of new phases of matter. Here we study the tight-binding model on the honeycomb lattice introduced by Haldane, for lattice bosons. We analyze the ground state topology and quasiparticle properties in the Mott phase by applying bosonic dynamical mean field theory, strong-coupling perturbation theory and exact diagonalization. The phase diagram also contains two different superfluid phases. The quasiparticle dynamics, number fluctuations, and local currents are measurable in cold atom experiments.

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