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Phys. Rev. Lett. 96, 180402 (2006) [4 pages]

Bose-Fermi Mixtures in a Three-Dimensional Optical Lattice

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Kenneth Günter, Thilo Stöferle, Henning Moritz, Michael Köhl, and Tilman Esslinger
Institute of Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland

Received 4 April 2006; published 9 May 2006

Wehave studied mixtures of fermionic ⁴⁰K and bosonic ⁸⁷Rb quantumgases in a three-dimensional optical lattice. We observe that anincreasing admixture of the fermionic species diminishes the phase coherenceof the bosonic atoms as measured by studying both thevisibility of the matter wave interference pattern and the coherencelength of the bosons. Moreover, we find that the attractiveinteractions between bosons and fermions lead to an increase ofthe boson density in the lattice which we measure bystudying three-body recombination in the lattice. In our data, wedo not observe three-body loss of the fermionic atoms. Ananalysis of the thermodynamics of a noninteracting Bose-Fermi mixture inthe lattice suggests a mechanism for sympathetic cooling of thefermions in the lattice.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.180402
DOI:	10.1103/PhysRevLett.96.180402
PACS:	03.75.Ss; 05.30.Fk; 34.50.-s; 71.10.Fd 03.75.Ss Degenerate Fermi gases 05.30.Fk Fermion systems and electron gas (quantum statistical mechanics) 34.50.-s Scattering of atoms and molecules 71.10.Fd Lattice fermion models (condensed matter) including Hubbard model, etc YEAR: 2006
KEYWORDS:	Bose-Einstein condensation, boson systems, fermion systems

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