Role of Interactions in {sup 87}Rb-{sup 40}K Bose-Fermi Mixtures in a 3D Optical Lattice
Journal Article
·
· Physical Review Letters
- Institut fuer Physik, Johannes Gutenberg-Universitaet Mainz, Staudinger Weg 7, 55128 Mainz (Germany)
We investigate the effect of interspecies interaction on a degenerate mixture of bosonic {sup 87}Rb and fermionic {sup 40}K atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the {sup 87}Rb-{sup 40}K interaction is tuned over a wide range. Through an analysis of the {sup 87}Rb 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.
- OSTI ID:
- 21180130
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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