A high phase-space density mixture of ${}^{87}$Rb and ${}^{133}$Cs: towards ultracold heteronuclear molecules

Abstract

We report the production of a high phase-space density mixture of ${}^{87}$Rb and ${}^{133}$Cs atoms in a levitated crossed optical dipole trap as the first step towards the creation of ultracold RbCs molecules via magneto-association. We present a simple and robust experimental setup designed for the sympathetic cooling of ${}^{133}$Cs via interspecies elastic collisions with ${}^{87}$Rb. Working with the $|F=1,m_F=+1>$ and the $|3,+3>$ states of ${}^{87}$Rb and ${}^{133}$Cs respectively, we measure a high interspecies three-body inelastic collision rate $\sim 10^{-25}-10^{-26}{\mathrm{cm}}^6{\mathrm{s}}^{-1}$ which hinders the sympathetic cooling. Nevertheless by careful tailoring of the evaporation we can produce phase-space densities near quantum degeneracy for both species simultaneously. In addition we report the observation of an interspecies Feshbach resonance at 181.7(5) G and demonstrate the creation of Cs${}_2$ molecules via magneto-association on the 4g(4) resonance at 19.8 G. These results represent important steps towards the creation of ultracold RbCs molecules in our apparatus.

arXiv comment7 pages, 6 figures

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Cited by in corpus (23)

• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Dual-Species Bose-Einstein Condensate of ${}^{87}$Rb and ${}^{133}$Cs
• Dynamics of single neutral impurity atoms immersed in an ultracold gas
• Towards the production of ultracold ground-state RbCs molecules: Feshbach resonances, weakly bound states, and coupled-channel model
• Production of optically trapped ${}^{87}$RbCs Feshbach molecules
• Controlling the Rotational and Hyperfine State of Ultracold ${}^{87}$Rb${}^{133}$Cs Molecules
• Universalities in ultracold reactions of alkali polar molecules
• Equilibrium solutions of immiscible two-species Bose-Einstein condensates in perturbed harmonic traps
• Feshbach resonances in ultracold 85Rb
• Two-photon photoassociation spectroscopy of CsYb: ground-state interaction potential and interspecies scattering lengths
• AC Stark Effect in Ultracold Polar RbCs Molecules
• A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules
• Feshbach spectroscopy of an ultracold mixture of ${}^{85}$Rb and ${}^{133}$Cs
• Dipole-dipole interactions in optical lattices do not follow an inverse cube power law
• Bose-Einstein condensation of 87Rb in a levitated crossed dipole trap
• Measurement of the binding energy of ultracold ${}^{87}$Rb${}^{133}$Cs molecules using an offset-free optical frequency comb
• Magnetic transport apparatus for the production of ultracold atomic gases in the vicinity of a dielectric surface
• Efficient production of an 87Rb F = 2, mF = 2 Bose-Einstein condensate in a hybrid trap
• Resonant control of polar molecules in an optical lattice
• The Role of Interspecies Interactions in the Preparation of a Low-entropy Gas of Polar Molecules in a Lattice
• Magnetic Feshbach resonances in collisions of non-magnetic closed-shell ${}^1\Sigma$ molecules
• Repeated output coupling of ultracold Feshbach molecules from a Cs BEC
• Quantum Degenerate Mixtures of Cs and Yb