韦伯数与量子液滴二体碰撞的结果
Weber number and the outcome of binary collisions between quantum droplets
AI总结：
研究在可行实验条件下量子液滴二体碰撞的理论分析，通过计算韦伯数探讨碰撞结果的不同 regime，包括液滴合并和破裂，同时量化原子损失机制。
摘要：
本文报告了在可行实验条件下量子液滴二体碰撞的理论分析。考虑了由超冷原子二元混合物构成的简正稀薄玻色气体所形成的液滴。基于随机相位近似下基态低能激发的研究，引入了液滴表面张力的可靠表达式。考虑了预期激发能估计，结合Thouless变分定理评估其相关性。表面张力表达式允许计算碰撞中涉及的液滴的韦伯数。识别了碰撞结果的多个 regime，从量子液滴的合并到破裂为更小液滴。对自蒸发和三体散射导致的液滴原子损失量进行了量化，针对同核和异核混合物。对这些损失的控制对于观察碰撞产生的有趣效应至关重要。
英文摘要：
A theoretical analysis of binary collisions of quantum droplets under feasible experimental conditions is reported. Droplets formed from degenerate dilute Bose gases made up from binary mixtures of ultra cold atoms are considered. Reliable expressions for the surface tension of the droplets are introduced based on a study of low energy excitations of their ground state within the random phase approximation. Their relevance is evaluated considering an estimation of the expected excitation energy having in mind the Thouless variational theorem. The surface tension expressions allow calculating the Weber number of the droplets involved in the collisions. Several regimes on the outcomes of the binary frontal collisions that range from the coalescence of the quantum droplets to their disintegration into smaller droplets are identified. Atoms losses of the droplets derived from self-evaporation and three-body scattering are quantified for both homo- and hetero-nuclear mixtures. Their control is mandatory for the observation of some interesting effects arising from droplets collisions.
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