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arXiv 1812.09151cond-mat.quant-gasphysics.atm-clusphysics.atom-phquant-ph
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自束缚量子液滴的碰撞

Collisions of self-bound quantum droplets

Giovanni Ferioli, Giulia Semeghini, Leonardo Masi, Giovanni Giusti, Giovanni Modugno, Massimo Inguscio, Albert Gallemì, Alessio Recati, Marco Fattori

摘要:

本文报道了由一个有吸引力的超冷原子混合物形成的量子液滴之间的二元碰撞。我们区分碰撞的两个主要结果,即合并和分离,这取决于碰撞对的速度。区分这两种情况的临界速度$v_c$对小液滴和大液滴的原子数$N$的依赖性不同。通过比较我们的实验结果与数值模拟,我们表明,非单调行为的$v_c(N)$是由于交叉从可压缩到不可压缩的制度,其中的碰撞动力学是由不同的能量尺度,即液滴结合能和表面张力。这些结果也提供了第一个证据的液体性质的量子液滴在大$N$限制,其行为非常类似于经典的液滴。

英文摘要:

We report on the study of binary collisions between quantum droplets formed by an attractive mixture of ultracold atoms. We distinguish two main outcomes of the collision, i.e. merging and separation, depending on the velocity of the colliding pair. The critical velocity $v_c$ that discriminates between the two cases displays a different dependence on the atom number $N$ for small and large droplets. By comparing our experimental results with numerical simulations, we show that the non-monotonic behavior of $v_c(N)$ is due to the crossover from a compressible to an incompressible regime, where the collisional dynamics is governed by different energy scales, i.e. the droplet binding energy and the surface tension. These results also provide the first evidence of the liquid-like nature of quantum droplets in the large $N$ limit, where their behavior closely resembles that of classical liquid droplets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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