Bose-Fermi Mixtures in a Three-Dimensional Optical Lattice

Kenneth Günter, Thilo Stöferle, Henning Moritz, Michael Köhl, and Tilman Esslinger
Phys. Rev. Lett. 96, 180402 – Published 9 May 2006

Abstract

We have studied mixtures of fermionic K40 and bosonic Rb87 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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  • Received 4 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.96.180402

©2006 American Physical Society

Authors & Affiliations

Kenneth Günter, Thilo Stöferle, Henning Moritz, Michael Köhl*, and Tilman Esslinger

  • Institute of Quantum Electronics, ETH Zürich, CH-8093 Zürich, Switzerland

  • *Electronic address: Koehl@phys.ethz.ch

See Also

Localization of Bosonic Atoms by Fermionic Impurities in a Three-Dimensional Optical Lattice

S. Ospelkaus, C. Ospelkaus, O. Wille, M. Succo, P. Ernst, K. Sengstock, and K. Bongs
Phys. Rev. Lett. 96, 180403 (2006)

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Vol. 96, Iss. 18 — 12 May 2006

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