Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions,Physical Review Research

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Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions
Physical Review Research ( IF 3.5 ) Pub Date : 2021-07-27 , DOI: 10.1103/physrevresearch.3.033096
Kali E. Wilson ₁ , Alexander Guttridge ₁ , I-Kang Liu ₂ , Jack Segal ₁ , Thomas P. Billam ₂ , Nick G. Parker ₂ , N. P. Proukakis ₂ , Simon L. Cornish ₁

Affiliation

We probe the collective dynamics of a quantum degenerate Bose-Bose mixture of

{}^{133}{Cs}

and

{}^{174}{Yb}

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

a_{Cs} < 50 a_{0}

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

中文翻译：

具有有吸引力的种间相互作用的简并 Cs-Yb 混合物的动力学

我们探索了量子简并玻色混合物的集体动力学

{}^{133}{CS}

和

{}^{174}镝

具有有吸引力的种间相互作用。具体来说，我们激发了 Cs 冷凝物的垂直质心振荡。我们观察到 Cs 偶极子模式的显着阻尼，这是由于能量快速转移到较大的 Yb 组件和随之而来的声学耗散。基于耦合的 Gross-Pitaevskii 方程的数值模拟与实验非常吻合，并且还揭示了后期复兴（跳动）的可能性，发现后者对 Cs 和 Yb 原子数组合高度敏感。通过使用广泛的 Feshbach 共振进一步调整 Cs 的相互作用强度，我们探索了简并混合物的稳定性。我们观察到由有吸引力的 Cs-Yb 相互作用介导的 Cs 凝聚物的崩溃，当

{一种}_{CS} < 50 {一种}_{0}

，远高于单一物种崩溃阈值，与模拟非常吻合。

更新日期：2021-07-27

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