Quantum Bubbles in Microgravity.,Physical Review Letters

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Quantum Bubbles in Microgravity.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-06-29 , DOI: 10.1103/physrevlett.125.010402
A Tononi ₁ , F Cinti _{2,

3,

4} , L Salasnich _{1,

5}

Affiliation

The recent developments of microgravity experiments with ultracold atoms have produced a relevant boost in the study of shell-shaped ellipsoidal Bose-Einstein condensates. For realistic bubble-trap parameters, here we calculate the critical temperature of Bose-Einstein condensation, which, if compared to the one of the bare harmonic trap with the same frequencies, shows a strong reduction. We simulate the zero-temperature density distribution with the Gross-Pitaevskii equation, and we study the free expansion of the hollow condensate. While part of the atoms expands in the outward direction, the condensate self-interferes inside the bubble trap, filling the hole in experimentally observable times. For a mesoscopic number of particles in a strongly interacting regime, for which more refined approaches are needed, we employ quantum Monte Carlo simulations, proving that the nontrivial topology of a thin shell allows superfluidity. Our work constitutes a reliable benchmark for the forthcoming scientific investigations with bubble traps.

中文翻译：

微重力中的量子气泡。

超冷原子微重力实验的最新进展在壳形椭圆形玻色-爱因斯坦凝聚物的研究中产生了重要的推动作用。对于实际的气泡阱参数，这里我们计算了玻色-爱因斯坦凝聚的临界温度，如果与具有相同频率的裸谐波阱之一相比，则显示出很大的降低。我们用Gross-Pitaevskii方程模拟零温度密度分布，并研究中空冷凝水的自由膨胀。当部分原子向外扩展时，冷凝物会在气泡捕集器内部发生自干扰，并在实验可观察的时间内填充孔。对于处于强相互作用状态的介观数量的粒子，需要更精细的方法，我们使用量子蒙特卡洛模拟，证明了薄壳的非平凡拓扑允许超流动。我们的工作为即将进行的带有气泡阱的科学研究提供了可靠的基准。

更新日期：2020-06-29

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