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

Abstract

We observe interspecies Feshbach resonances due to s-wave bound states in ultracold ${}^{39}$K-${}^{133}$Cs 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 ${}^{39}$K-Cs, ${}^{40}$K-Cs and ${}^{41}$K-Cs. Our results open up the possibilities of tuning interactions in K-Cs atomic mixtures and of producing ultracold KCs molecules.

16 pages, 8 figures

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Cited by in corpus (5)

• Observation and modelling of bound-free transitions to the $X^1{\Sigma }^{+}$ and $a^3{\Sigma }^{+}$ states of KCs
• Inelastic losses in radiofrequency-dressed traps for ultracold atoms
• Study of excited electronic states of the ${}^{39}$KCs molecule correlated with the K($4^2$S)+Cs($5^2$D) asymptote: experiment and theory
• Quantum dynamics of impurities in a Bose-Einstein condensate
• Intensities of KCs $E(4{)}^1{\Sigma }^{+}\to (a^3{\Sigma }^{+},X^1{\Sigma }^{+})$ band system up to dissociation threshold: an interplay between spin-orbit, hyperfine and rovibronic coupling effects