铯原子与二聚体的共振碰撞：正散射长度下的普适性检验
Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
摘要：
我们研究了铯原子和二聚体的超冷混合物在550 G附近的费什巴赫共振的碰撞性质，在正$s$波散射长度的制度。我们观察到一个原子二聚体损失共振，这是有关Efimov的三聚体状态的情况。在散射长度的值处发现共振，该散射长度的值不同于在低磁场处的先前观察。这表明正散射长度的Efimov谱的非普适行为。我们比较我们的观察与预测从有效场论和最近的模型的基础上的范德华相互作用。我们提出了额外的测量纯原子样品，以检查在其他原子物种的观察所建议的雪崩效应相关的谐振损耗功能的存在。我们无法确认这种特征的存在。
英文摘要：
We study the collisional properties of an ultracold mixture of cesium atoms and dimers close to a Feshbach resonance near 550G in the regime of positive $s$-wave scattering lengths. We observe an atom-dimer loss resonance that is related to Efimov's scenario of trimer states. The resonance is found at a value of the scattering length that is different from a previous observation at low magnetic fields. This indicates non-universal behavior of the Efimov spectrum for positive scattering lengths. We compare our observations with predictions from effective field theory and with a recent model based on the van der Waals interaction. We present additional measurements on pure atomic samples in order to check for the presence of a resonant loss feature related to an avalanche effect as suggested by observations in other atomic species. We could not confirm the presence of such a feature.
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