Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Gases: Bosons II

Q 12.4: Talk

Monday, March 23, 2015, 15:15–15:30, P/H2

Bose-Hubbard ladder subject to effective magnetic field: geometry and dynamics — •Wladimir Tschischik, Roderich Moessner, and Masud Haque — Max Planck Institute for the Physics of Complex Systems, Dresden

Motivated by a recent experimental realization of an optical lattice system with an effective magnetic field (Atala et al., Nature Physics 10, 588 (2014)), we study a Bose-Hubbard system on a two-leg ladder with complex hopping amplitudes. This system shows a quantum phase transition already without interactions. We examine and present differences between the periodic, open-boundary, and harmonically trapped cases. We present a striking "slowing down" effect in the collective mode dynamics near the phase transition.