Bose-Fermi Mixtures in a Three-dimensional Optical Lattice

Details Bose-Fermi Mixtures in a Three-dimensional Optical Lattice Bose-Fermi Mixtures in a Three-dimensional Optical Lattice

2006-04-05

arxiv.org/abs/cond-mat/0604139v2

Phys. Rev. Lett. 96, 180402 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.96.180402

We have studied mixtures of fermionic $^{40}$K and bosonic $^{87}$Rb quantum gases in a three-dimensional optical lattice. We observe that an increasing admixture of the fermionic species diminishes the phase coherence of the bosonic atoms as measured by studying both the visibility of the matter wave interference pattern and the coherence length of the bosons. Moreover, we find that the attractive interactions between bosons and fermions lead to an increase of the boson density in the lattice which we measure by studying three-body recombination in the lattice. In our data we do not observe three-body loss of the fermionic atoms. An analysis of the thermodynamics of a noninteracting Bose-Fermi mixture in the lattice suggests a mechanism for sympathetic cooling of the fermions in the lattice.

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