Role of interactions in Rb87-K40 Bose-Fermi mixtures in a 3D optical lattice

Th Best; S. Will; U. Schneider; L. Hackermüller; D. Van Oosten; I. Bloch; D. S. Lühmann

doi:10.1103/PhysRevLett.102.030408

Role of interactions in Rb87-K40 Bose-Fermi mixtures in a 3D optical lattice

Th Best, S. Will, U. Schneider, L. Hackermüller, D. Van Oosten, I. Bloch, D. S. Lühmann

Research output: Contribution to journal › Article › peer-review

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 Rb87-K40 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.

Original language	English
Article number	030408
Journal	Physical Review Letters
Volume	102
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.102.030408
Publication status	Published - 20 Jan 2009
Externally published	Yes

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10.1103/PhysRevLett.102.030408

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title = "Role of interactions in Rb87-K40 Bose-Fermi mixtures in a 3D optical lattice",

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 Rb87-K40 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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AU - Best, Th

AU - Will, S.

AU - Schneider, U.

AU - Hackermüller, L.

AU - Van Oosten, D.

AU - Bloch, I.

AU - Lühmann, D. S.

PY - 2009/1/20

Y1 - 2009/1/20

N2 - 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 Rb87-K40 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.

AB - 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 Rb87-K40 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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DO - 10.1103/PhysRevLett.102.030408

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Role of interactions in Rb87-K40 Bose-Fermi mixtures in a 3D optical lattice

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