Superfluidity of Interacting Bosonic Mixtures in Optical Lattices

Details Superfluidity of Interacting Bosonic Mixtures in Optical Lattices Superfluidity of Interacting Bosonic Mixtures in Optical Lattices

2010-02-22

arxiv.org/abs/1002.4015v2

Phys.Rev.Lett. 105, 045303 (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.105.045303

We report the observation of many-body interaction effects for a homonuclear bosonic mixture in a three-dimensional optical lattice with variable state dependence along one axis. Near the superfluid-to-Mott insulator transition for one component, we find that the presence of a second component can reduce the apparent superfluid coherence, most significantly when it either experiences a strongly localizing lattice potential or none at all. We examine this effect by varying the relative populations and lattice depths, and discuss the observed behavior in view of recent proposals for scattering from impurities and of atom-phonon coupling for atoms immersed in a superfluid.

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