Multichannel interactions of two atoms in an optical tweezer
Multichannel interactions of two atoms in an optical tweezer
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DOI：
10.1103/physrevresearch.2.023108
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发表时间：
2020-04-30
影响因子：
4.2
通讯作者：
Ni, K-K
中科院分区：
文献类型：
--
作者：
Hood, J. D.;Yu, Y.;Ni, K-K
多通道Na-Cs相互作用的特征是利用光镊子中的两个原子进行的一系列测量，以及具有最小输入参数的多通道量子亏损理论(MQDT)。通过对Na-Cs的运动态和最小束缚分子态的拉曼光谱测量了三重态和单重态的散射长度。双尺度MQDT通过引入-C-8/r(8)势和-C-6/r(6)势，提高了单尺度模型的精度。在MQDT预测的1%以内的场中，只观察到了两个原子的磁性Feshbach共振。我们基于镊子的方法与有效的相互作用理论相结合，为未来研究更复杂的相互作用提供了一种方法，例如原子-分子和分子-分子相互作用，而传统的高相空间密度块状气体技术在技术上具有挑战性。
The multichannel Na-Cs interactions are characterized by a series of measurements using two atoms in an optical tweezer, along with a multichannel quantum defect theory (MQDT) with minimal input parameters. The triplet and singlet scattering lengths are measured by performing Raman spectroscopy of the Na-Cs motional states and least-bound molecular state in the tweezer. The two-scaleMQDT improves accuracy over the single-scale model by incorporating the -C-8/r(8) potential in addition to the -C-6/r(6) potential. Magnetic Feshbach resonances are observed for only two atoms at fields which agree to within 1% of the MQDT predictions. Our tweezer-based approach, combined with an effective theory of interaction, provides a methodology for future studies of more complex interactions, such as atom-molecule and molecule-molecule interactions, and where the traditional high-phase-space-density bulk-gas techniques are technically challenging.