Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions

Wilson, K.E.; Guttridge, A.; Liu, I-Kang; Segal, J.; Billam, T.P.; Parker, N.G.; Proukakis, N.P.; Cornish, S.L.

Abstract

We probe the collective dynamics of a quantum degenerate Bose-Bose mixture of 133Cs and 174Yb with attractive interspecies interactions. Specifically, we excite vertical center-of-mass oscillations of the Cs condensate. We observe significant damping for the Cs dipole mode, due to the rapid transfer of energy to the larger Yb component and the ensuing acoustic dissipation. Numerical simulations based on coupled Gross-Pitaevskii equations provide excellent agreement with experiment and additionally reveal the possibility of late-time revivals (beating), which are found to be highly sensitive to the Cs and Yb atom number combinations. By further tuning the interaction strength of Cs using a broad Feshbach resonance, we explore the stability of the degenerate mixture. We observe collapse of the Cs condensate mediated by the attractive Cs-Yb interaction when aCs < 50 a0, well above the single-species collapse threshold, in good agreement with simulations.

Citation

Wilson, K., Guttridge, A., Liu, I.-K., Segal, J., Billam, T., Parker, N., Proukakis, N., & Cornish, S. (2021). Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions. Physical Review Research, 3(3), Article 033096. https://doi.org/10.1103/physrevresearch.3.033096

• Journal Article Type: Article
• Acceptance Date: Jun 9, 2021
• Online Publication Date: Jul 27, 2021
• Publication Date: 2021-07
• Deposit Date: Dec 18, 2020
• Publicly Available Date: Jul 28, 2021
• Journal: Physical Review Research
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 3
• Issue: 3
• Article Number: 033096
• DOI: https://doi.org/10.1103/physrevresearch.3.033096
• Public URL: https://durham-repository.worktribe.com/output/1283289