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

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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… Click to show full 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.

Keywords: interspecies feshbach; ultracold 39k; interaction potentials; feshbach resonances; 39k 133cs

Journal Title: Physical Review A
Year Published: 2017

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