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

Lookup NU author(s): Dr Gary LiuORCiD, Dr Thomas BillamORCiD, Professor Nick ParkerORCiD, Professor Nikolaos ProukakisORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


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<50a0, well above the single-species collapse threshold, in good agreement with simulations.

Publication metadata

Author(s): Wilson KE, Guttridge A, Liu I-Kang, Segal J, Billam TP, Parker NG, Proukakis NP, Cornish SL

Publication type: Article

Publication status: Published

Journal: Physical Review Research

Year: 2021

Volume: 3

Issue: 3

Online publication date: 27/07/2021

Acceptance date: 09/07/2021

Date deposited: 30/07/2021

ISSN (electronic): 2643-1564

Publisher: American Physical Society


DOI: 10.1103/PhysRevResearch.3.033096


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Funder referenceFunder name
Quantera ERA-NET cofund project NAQUAS