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arXiv:1602.03947 · Physical Review Letters

Creation of an Ultracold Gas of Ground-State Dipolar Na 23 Rb 87 Molecules

Mingyang Guo, Bing Zhu, Bo Lü, Xin Ye, Fudong Wang, Romain Véxiau, Nadia Bouloufa-Maafa, Goulven Quéméner, Olivier Dulieu, Dajun Wang

Published May 19, 2016• 369 citations
arXivHTMLPDF

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 magnetoassociation, 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 1 D. 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.

DOI
10.1103/physrevlett.116.205303

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