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Two-Component Bosons in state-dependent optical lattices

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I will present our recent experiments with binary hyperfine-state mixtures of Rb-87 in a three-dimensional optical lattice with state dependence along one axis. We have studied how the transition of one component from superfluid to Mott-insulator is affected by the presence and the properties of a second, tunable ‘background’ component. We interpret our findings in terms of a polaron-like dressing and the formation of a quantum emulsion. Further, I will discuss our observation of four-wave mixing of macroscopically populated two-component matter waves in a collinear geometry. With its particular combination of internal and external states, this system lends itself to possible applications in the context of quantum atom optics. Finally, I will talk about our most recent work, matter-wave scattering from a dilute atomic crystal.

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