Improved characterization of Feshbach resonances and interaction potentials between 23Na and 87Rb atoms

Guo, Zhichao; Jia, Fan; Zhu, Bing; Li, Lintao; Hutson, Jeremy M.; Wang, Dajun

Abstract

The ultracold mixture of 23Na and 87Rb atoms has become an important system for investigating physics in Bose-Bose atomic mixtures and for forming ultracold ground-state polar molecules. In this work, we provide an improved characterization of the most commonly used Feshbach resonance near 347.64 G between 23Na and 87Rb in their absolute ground states. We form Feshbach molecules using this resonance and measure their binding energies by dissociating them via magnetic-field modulation. We use the binding energies to refine the singlet and triplet potential-energy curves, using coupled-channel bound-state calculations. We then use coupled-channel scattering calculations on the resulting potentials to produce a high-precision mapping between magnetic field and scattering length. We also observe ten additional s-wave Feshbach resonances for 23Na and 87Rb in different combinations of Zeeman sublevels of the F = 1 hyperfine states. Some of the resonances show two-body inelastic decay due to spin exchange. We compare the resonance properties with coupled-channel scattering calculations that full take account of inelastic properties.

Citation

Guo, Z., Jia, F., Zhu, B., Li, L., Hutson, J. M., & Wang, D. (2022). Improved characterization of Feshbach resonances and interaction potentials between 23Na and 87Rb atoms. Physical Review A, 105(2), Article 023313. https://doi.org/10.1103/physreva.105.023313

• Journal Article Type: Article
• Acceptance Date: Jan 18, 2022
• Online Publication Date: Feb 11, 2022
• Publication Date: 2022-02
• Deposit Date: Feb 12, 2022
• Publicly Available Date: Jun 14, 2022
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 105
• Issue: 2
• Article Number: 023313
• DOI: https://doi.org/10.1103/physreva.105.023313
• Related Public URLs: https://arxiv.org/abs/2108.01856