Observation of interspecies Feshbach resonances in an ultracold 39K-133Cs mixture and refinement of interaction potentials

Gröbner, M.; Weinmann, P.; Kirilov, E.; Nägerl, H. -C.; Julienne, P. S.; Le Sueur, C. R.; Hutson, J. M.

Abstract

We observe interspecies Feshbach resonances due to s-wave bound states in ultracold 39K -133Cs scattering for three different spin mixtures. The resonances are observed as joint atom loss and heating of the K sample. We perform least-squares fits to obtain improved K-Cs interaction potentials that reproduce the observed resonances, and carry out coupled-channel calculations to characterize the scattering and bound-state properties for 39K-Cs, 40K-Cs, and 41K-Cs. Our results open up the possibilities of tuning interactions in K-Cs atomic mixtures and of producing ultracold KCs molecules.

Citation

Gröbner, M., Weinmann, P., Kirilov, E., Nägerl, H. .-C., Julienne, P. S., Le Sueur, C. R., & Hutson, J. M. (2017). Observation of interspecies Feshbach resonances in an ultracold 39K-133Cs mixture and refinement of interaction potentials. Physical Review A, 95(2), Article 022715. https://doi.org/10.1103/physreva.95.022715

• Journal Article Type: Article
• Acceptance Date: Feb 7, 2017
• Online Publication Date: Feb 28, 2017
• Publication Date: Feb 28, 2017
• Deposit Date: Mar 1, 2017
• Publicly Available Date: Mar 3, 2017
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 95
• Issue: 2
• Article Number: 022715
• DOI: https://doi.org/10.1103/physreva.95.022715
• Public URL: https://durham-repository.worktribe.com/output/1384244