Three-Body Recombination of Ultracold Microwave-Shielded Polar Molecules

• URL: http://arxiv.org/abs/2407.04901v1
• Date: Sat, 6 Jul 2024 00:31:31 GMT
• Title: Three-Body Recombination of Ultracold Microwave-Shielded Polar Molecules
• Authors: Ian Stevenson, Shayamal Singh, Ahmed Elkamshishy, Niccoló Bigagli, Weijun Yuan, Siwei Zhang, Chris H. Greene, Sebastian Will,
• Abstract summary: Ground-state polar molecules dressed with a strong microwave field have field-linked bound states. Recombination can explain the enhanced loss rates observed at small microwave detunings.
• Score: 2.575307730842485
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: A combined experimental and theoretical study is carried out on the three-body recombination process in a gas of microwave-shielded polar molecules. For ground-state polar molecules dressed with a strong microwave field, field-linked bound states can appear in the intermolecular potential. We model three-body recombination into such bound states using classical trajectory calculations. Our results show that recombination can explain the enhanced loss rates observed at small microwave detunings in trapped samples of bosonic NaCs [Bigagli, $\textit{et al.}$, Nat. Phys. $\textbf{19}$ 1579-1584 (2023)]. Specifically, our calculations reproduce the experimentally measured three-body loss rates across a wide range of microwave Rabi couplings, detunings, and temperatures. This work suggests that for bosonic shielded molecular systems in which the two-body loss is sufficiently suppressed and a field-linked bound state is present, the dominant loss process will be three-body recombination.

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