Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice

Details Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice Role of interactions in 87Rb-40K Bose-Fermi mixtures in a 3d optical lattice

2008-07-28

arxiv.org/abs/0807.4504v1

Phys.Rev.Lett.102:030408,2009

Physics

Condensed Matter

Other Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.102.030408

We investigate the effect of interspecies interaction on a degenerate mixture of bosonic 87Rb and fermionic 40K atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the 87Rb-40K interaction is tuned over a wide range. Through an analysis of the 87Rb momentum distribution, we find a pronounced asymmetry between strong repulsion and strong attraction. In the latter case, the Bose-Hubbard parameters are renormalized due to self-trapping, leading to a marked shift in the superfluid to Mott insulator transition with increasing Bose-Fermi interaction.

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