Degenerate Bose-Bose mixture in a three-dimensional optical lattice

Year: 2008

Authors: Catani J., De Sarlo L., Barontini G., Minardi F., Inguscio M.

Autors Affiliation: LENS—European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Università di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy;
CNR-INFM, via G. Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy;
INFN, via G. Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy

Abstract: We produce a heteronuclear quantum degenerate mixture of two bosonic species, (87)Rb and (41)K, in a three-dimensional optical lattice. On raising the lattice barriers, we observe the disappearance of the inference pattern of the heavier (87)Rb, shifting toward shallower lattice depths in the presence of a minor fraction of (41)K. This effect is sizable and requires only a marginal overlap between the two species. We compare our results with similar findings reported for Fermi-Bose mixtures and discuss the interpretation scenarios proposed to date, arguing that the explanation may be linked to the increased effective mass due to the interspecies interactions.


Volume: 77 (1)      Pages from: 011603  to: 011603

KeyWords: Bosons; Crystal lattices; Molecular interactions, Fermi-Bose mixtures; Interspecies interactions; Lattice barriers; Lattice depths; Optical lattice, Quantum theory
DOI: 10.1103/PhysRevA.77.011603

Citations: 203
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