Abstract
We investigate the effect of interspecies interaction on a degenerate mixture of bosonic and fermionic atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the interaction is tuned over a wide range. Through an analysis of the 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.
- Received 22 July 2008
DOI:https://doi.org/10.1103/PhysRevLett.102.030408
©2009 American Physical Society