Year: 2023
Type: article
Abstract: Recent years have witnessed tremendous progress 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 nonreactive bosonic 23 Na 87 Rb molecules with a circularly polarized microwave blue detuned to the rotational transition.We achieve suppression of the loss by 2 orders of magnitude with the lowest two-body loss rate coefficient reduced to 3 × 10 -12 cm 3 =s.Meanwhile, the elastic collision rate coefficient is increased to the 10 -8 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.
Source: Physical Review X
Institutions: Chinese University of Hong Kong, Wuhan University, Centre National de la Recherche Scientifique, Université Paris-Saclay, Laboratoire Aimé Cotton, Chinese Academy of Sciences, Institute of Theoretical Physics, University of Chinese Academy of Sciences, Beihang University, Chinese University of Hong Kong, Shenzhen
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,200
OpenAlex ID: W4386860639