Microwave shielding of bosonic NaRb molecules

• URL: http://arxiv.org/abs/2304.08312v2
• Date: Sun, 30 Apr 2023 09:58:36 GMT
• Title: Microwave shielding of bosonic NaRb molecules
• Authors: Junyu Lin, Guanghua Chen, Mucan Jin, Zhaopeng Shi, Fulin Deng, Wenxian Zhang, Goulven Qu\'em\'ener, Tao Shi, Su Yi, Dajun Wang
• Abstract summary: We investigate the loss suppression of non-reactive bosonic $23$Na$87$Rb molecules with a polarized circular microwave blue-detuned to the rotational transition. We achieve suppression of the loss by two orders of magnitude with the lowest two-body loss rate coefficient reduced to $3times10-12rmcm3/s$. With further improvements, this technique holds great promises for creating a Bose-Einstein condensate of ultracold polar molecules.
• Score: 3.0989511386089355
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent years have witnessed tremendous progresses in creating and manipulating ground-state ultracold polar molecules. However, the two-body loss regardless of the chemical reactivities is still a hurdle for many future explorations. Here, we investigate the loss suppression of non-reactive bosonic $^{23}$Na$^{87}$Rb molecules with a circular polarized microwave blue-detuned to the rotational transition. We achieve suppression of the loss by two orders of magnitude with the lowest two-body loss rate coefficient reduced to $3\times10^{-12}~\rm{cm^3/s}$. Meanwhile, the elastic collision rate coefficient is increased to the $10^{-8}~\rm{cm^3/s}$ level. The large good-to-bad collision ratio has allowed us to carry out evaporative cooling of $^{23}$Na$^{87}$Rb with an efficiency of 1.7(2), increasing the phase-space density by a factor of 10. With further improvements, this technique holds great promises for creating a Bose-Einstein condensate of ultracold polar molecules.

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