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Poster Session

Poster Session III

4:00 pm – 6:00 pm, Thursday June 19 Session S00 Oregon Convention Center:, Exhibit Hall E
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High-Efficiency Evaporative Cooling of Ultracold NaRb Molecules Assisted by Double Microwave Dressing

Poster 17
Presenter: Dajun Wang (Chinese University of Hong Kong)
Authors: Zhaopeng Shi (Department of Physics, The Chinese University of Hong Kong), Zerong Huang (The Chinese University of Hong Kong)

While the production of ground-state ultracold polar molecules via magneto-association of ultracold atoms has become a mature technique, the near-universal two-body collisional loss presents a significant challenge for further evaporative cooling toward quantum degeneracy. In this work, using the recently developed double microwave dressing technique, we achieve more than 1000-fold suppression of loss while maintaining a high good-to-bad collision ratio. This has allowed us to carry out efficient evaporative cooling in an optical trap with an efficiency higher than 2.5, ultimately leading to the observation of Bose-Einstein condensation (BEC) of NaRb molecules. Together with the earlier NaCs BEC experiment, our results demonstrate that the double microwave dressing technique provides a general pathway toward achieving quantum degeneracy in bosonic ultracold polar molecules.

Funding acknowledgement

This work was supported by the Hong Kong RGC General Research Fund (Grants 14302722 and 14304323), and the Collaborative Research Fund C6009-20GF.

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