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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.

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I-Kang Liu

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Jack Segal
Research Assistant

T.P. Billam

N.G. Parker

N.P. Proukakis


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.


Wilson, K., Guttridge, A., Liu, I., Segal, J., Billam, T., Parker, N., …Cornish, S. (2021). Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions. Physical Review Research, 3(3), Article 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


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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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