Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.030408
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- DFG
- EU (IP SCALA, MC-EXT QUASICOMBS)
- DARPA
- MATCOR
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We investigate the effect of interspecies interaction on a degenerate mixture of bosonic Rb-87 and fermionic K-40 atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the Rb-87-K-40 interaction is tuned over a wide range. Through an analysis of the Rb-87 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.
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