Poster Session

Poster Session I (4pm-6pm CDT)

4:00 pm – 6:00 pm, Tuesday June 4 // Session D00

Topics:

Loss suppression and interaction tuning in ultracold NaCs via double microwave shielding

Poster 21

Presenter: Haneul Kwak (Columbia University)

Authors: Niccolò Bigagli (Columbia University), Weijun Yuan (Columbia University), Siwei Zhang (Columbia University), Boris Bulatovic (Columbia University), Tijs Karman (Radboud University Nijmegen), Ian Stevenson (Columbia Univ), Sebastian Will (Columbia University)

Strong suppression of two- and three-body losses via double microwave shielding allows us to evaporatively cool sodium-cesium molecules. This led to our recent realization of a BEC of dipolar NaCs molecules [1]. Microwave shielding with a single circularly polarized field has been shown to realize a strong collisional barrier, but can open a channel for three-body loss. By introducing a second microwave field, three-body loss is suppressed. With double microwave shielding we create BECs with a condensate fraction above 50% and a temperature of 6(2) nK. The degenerate molecular clouds are found to be stable, with a lifetime close to 2 seconds. More recently, we have explored methods for controlling s-wave contact and dipole-dipole interactions in the BEC.

[1] “Observation of Bose-Einstein condensation in a gas of dipolar molecules,” Bigagli, N., Yuan, W., Zhang, S., Bulatovic, B., Karman, T., Stevenson, I., Will, S., arXiv:2312.10965 (2023).

Funding acknowledgement

We acknowledge funding support from NSF, ONR, and the Moore Foundation.

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