Feshbach spectroscopy of an ultracold mixture of ${}^{85}$Rb and ${}^{133}$Cs

Abstract

We report the observation of interspecies Feshbach resonances in an optically trapped mixture of ${}^{85}$Rb and ${}^{133}$Cs. We measure 14 interspecies features in the lowest spin channels for a magnetic field range from 0 to 700 G and show that they are in good agreement with coupled-channel calculations. The interspecies background scattering length is close to zero over a large range of magnetic fields, permitting the sensitive detection of Feshbach resonances through interspecies thermalisation. Our results confirm the quality of the Rb-Cs potential curves and offer promising starting points for the production of ultracold polar molecules.

5 pages, 4 figures

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Cited by in corpus (6)

• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Contrasting the wide Feshbach resonances in ${}^6$Li and ${}^7$Li
• Feshbach resonances in ultracold 85Rb
• A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules
• Stochastic Projected Gross-Pitaevskii equation for spinor and multi-component condensates
• Feshbach resonances, molecular bound states and prospects of ultracold molecule formation in mixtures of ultracold K and Cs