具有近简并连续谱的自旋1气体中的弱束缚少体态
Loosely Bound Few-Body States in a Spin-1 Gas with Near-Degenerate Continua
AI总结：
本研究构建含两个原子连续谱与一个闭分子通道的最小模型，探究玻色锂近简并两体连续谱对窄Feshbach共振附近少体物理的影响，揭示Efimov三聚体能级的特殊规律，补充了相关三通道模型，解释了实验观测的激发Efimov能级反常行为的可能成因。
摘要：
玻色锂原子超冷碰撞的一个显著特征是存在两个近简并的两体连续谱。本研究在包含两个原子连续谱和一个闭分子通道的最小模型框架下，探究了这种近简并性对窄Feshbach共振附近少体物理的影响。该模型可用于分析弱束缚二聚体与三聚体的自旋组成。在两体范畴内，模型定性复现了已被广泛证实的锂原子耦合通道计算的唯象结果，并对其特殊性进行了强调与阐明。在三体范畴内我们发现，Efimov三聚体能级与单连续谱情形相比遵循不同的函数形式，但其阈值保持不变。这种含两个原子连续谱的三通道模型，补充了我们此前提出的含两个分子通道的三通道模型[Y. Yudkin and L. Khaykovich, Phys. Rev. A 103, 063303 (2021)]，且表明实验观测到的第一激发Efimov能级的反常行为[Y. Yudkin, R. Elbaz and L. Khaykovich, arXiv:2004.02723]极有可能是由相互作用势的短程细节导致的。
英文摘要：
A distinguishing feature of ultracold collisions of bosonic lithium atoms is the presence of two near-degenerate two-body continua. The influence of such a near-degeneracy on the few-body physics in the vicinity of a narrow Feshbach resonance is investigated within the framework of a minimal model with two atomic continua and one closed molecular channel. The model allows analysis of the spin composition of loosely bound dimers and trimers. In the two-body sector the well-established coupled-channels calculations phenomenology of lithium is qualitatively reproduced, and its particularities are emphasized and clarified. In the three-body sector we find that the Efimov trimer energy levels follow a different functional form as compared to a single continuum scenario while the thresholds remain untouched. This three-channel model with two atomic continua complements our earlier developed three-channel model with two molecular channels [Y. Yudkin and L. Khaykovich, Phys. Rev. A 103, 063303 (2021)] and suggests that the experimentally observed exotic behavior of the first excited Efimov energy level [Y. Yudkin, R. Elbaz and L. Khaykovich, arXiv:2004.02723] is most probably caused by the short-range details of the interaction potential.
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