Creation of an ultracold gas of ground-state ${}^{23}{\mathrm{Na}}^{87}\mathrm{Rb}$ molecules

Abstract

We report the successful production of an ultracold sample of absolute ground-state ${}^{23}$Na${}^{87}$Rb molecules. Starting from weakly-bound Feshbach molecules formed via magneto-association, the lowest rovibrational and hyperfine level of the electronic ground state is populated following a high efficiency and high resolution two-photon Raman process. The high purity absolute ground-state samples have up to 8000 molecules and densities of over $10^{11}$ cm${}^{-3}$. By measuring the Stark shifts induced by external electric fields, we determined the permanent electric dipole moment of the absolute ground-state ${}^{23}$Na${}^{87}$Rb and demonstrated the capability of inducing an effective dipole moment over one Debye. Bimolecular reaction between ground-state ${}^{23}$Na${}^{87}$Rb molecules is endothermic, but we still observed a rather fast decay of the molecular sample. Our results pave the way toward investigation of ultracold molecular collisions in a fully controlled manner, and possibly to quantum gases of ultracold bosonic molecules with strong dipolar interactions.

5pages, 5 figures

References in corpus (10)

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• Ultracold Dipolar Gas of Fermionic ${}^{23}$Na${}^{40}$K Molecules in their Absolute Ground State
• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Reactions of ultracold alkali metal dimers
• Novel quantum phases of dipolar Bose gases in optical lattices
• Formation of Ultracold NaRb Feshbach Molecules
• Tuning ultracold collisions of excited rotational dipolar molecules
• Long-range states of the NaRb molecule near the Na($3^2{S}_{1/2}$)+Rb($5^2{P}_{3/2}$) asymptote

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