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

Gröbner, M. and Weinmann, P. and Kirilov, E. and Nägerl, H.-C. and Julienne, P. S. and Le Sueur, C. R. and 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). 022715.


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.

Item Type:Article
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Publisher statement:Reprinted with permission from the American Physical Society: Physical Review A 95, 022715 © (2017) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:07 February 2017
Date deposited:03 March 2017
Date of first online publication:28 February 2017
Date first made open access:03 March 2017

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