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.

arXiv comment5 pages, 4 figures

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• Production of optically trapped ${}^{87}$RbCs Feshbach molecules
• Contrasting the wide Feshbach resonances in ${}^6$Li and ${}^7$Li
• Observation of Feshbach resonances between ultracold Na and Rb atoms
• Generating mesoscopic Bell states via collisions of distinguishable quantum bright solitons
• Observation of "broad" d-wave Feshbach resonances with a triplet structure
• Feshbach resonances in ultracold 85Rb
• A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules
• Deviations from Born-Oppenheimer mass scaling in spectroscopy and ultracold molecular physics
• Stochastic Projected Gross-Pitaevskii equation for spinor and multi-component condensates
• Observation of broad p-wave Feshbach resonances in ultracold ${}^{85}$Rb-${}^{87}$Rb mixtures
• Broad Feshbach resonances in ultracold alkali-metal systems
• Feshbach resonances, molecular bound states and prospects of ultracold molecule formation in mixtures of ultracold K and Cs
• Characterizing Feshbach resonances in ultracold scattering calculations
• Magnetic Feshbach resonances in ultracold collisions between Cs and Yb atoms
• Model for the hyperfine structure of electronically-excited $\mathrm{KCs}$ molecules
• Laser Cooling of 85Rb Atoms to the Recoil Temperature Limit
• Number-conserving approaches to $n$-component Bose-Einstein condensates
• Ultracold collisions of Cs in excited hyperfine and Zeeman states
• Inelastic collisions in radiofrequency-dressed mixtures of ultracold atoms
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• Confinement-induced resonances for the creation of quasi-one-dimensional ultra cold gases of alkali--alkaline-earth dimers
• Quasi-integrability and nonlinear resonances in cold atoms under modulation
• Control, competition and coexistence of effective magnetic orders by interactions in Bose-Einstein condensates with high-Q cavities