Role of Interactions in Rb87K40 Bose-Fermi Mixtures in a 3D Optical Lattice

Th. Best, S. Will, U. Schneider, L. Hackermüller, D. van Oosten, I. Bloch, and D.-S. Lühmann
Phys. Rev. Lett. 102, 030408 – Published 23 January 2009

Abstract

We investigate the effect of interspecies interaction on a degenerate mixture of bosonic Rb87 and fermionic K40 atoms in a three-dimensional optical lattice potential. Using a Feshbach resonance, the Rb87K40 interaction is tuned over a wide range. Through an analysis of the Rb87 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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  • Received 22 July 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.030408

©2009 American Physical Society

Authors & Affiliations

Th. Best, S. Will, U. Schneider, L. Hackermüller, D. van Oosten*, and I. Bloch

  • Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, 55128 Mainz, Germany

D.-S. Lühmann

  • I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Germany

  • *Present address: FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands

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Vol. 102, Iss. 3 — 23 January 2009

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