Role of Interactions in Rb87-K40 Bose-Fermi Mixtures in a 3D Optical Lattice

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2009
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  • We investigate the effect of interspecies interaction on a degenerate mixture of bosonic Rb87 and fermionic K40 atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the Rb87-K40 interaction is tuned over a wide range. Through an analysis of the Rb87 momentum distribution, we find a pronounced asymmetry between strong repulsion and strong attraction. In the latter case, we observe a marked shift in the superfluid to Mott insulator transition, which we attribute to a renormalization of the Bose-Hubbard parameters due to self-trapping. © 2009 The American Physical Society.
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