一种适合在光学晶格中制备基态RbCs分子的缔合序列
An association sequence suitable for producing ground-state RbCs molecules in optical lattices
AI总结：
本文提出一种在光学晶格中制备基态RbCs分子的缔合序列，通过构建激发态模型并利用磁缔合与射频辐射导航至适合STIRAP的初始态，实现了85(4)%单向效率的基态制备。
摘要：
我们确定了一种制备$^{87}$Rb$^{133}$Cs分子（处于$\ extrm{X} \, ^1Σ^+$振转基态）的路径，该路径与光学晶格中原子的有效混合兼容。我们首先构建了激发态结构的模型，所用常数是通过对相关$\ extrm{a} \, ^3Σ^+ \ ightarrow \ extrm{b} \, ^3Π_1$跃迁（在181.5 G和217.1 G处）的光谱进行拟合得到的。然后，我们将该模型预测的跃迁偶极矩阵元与已成功用于181.5 G处STIRAP的跃迁矩阵元进行比较。我们通过在352.7 G处的宽物种间Feshbach共振进行磁缔合形成分子，并探索了305 G附近的Feshbach态图样。这使我们能够通过用射频辐射跳越一个避免交叉，导航到适合STIRAP的初始态。我们确定了305 G处适合STIRAP的跃迁。我们在实验上表征了这些跃迁，并演示了向基态单一超精细能级的STIRAP，单向效率为85(4)%。
英文摘要：
We identify a route for the production of $^{87}$Rb$^{133}$Cs molecules in the $\textrm{X} \, ^1Σ^+$ rovibronic ground state that is compatible with efficient mixing of the atoms in optical lattices. We first construct a model for the excited-state structure using constants found by fitting to spectroscopy of the relevant $\textrm{a} \, ^3Σ^+ \rightarrow \textrm{b} \, ^3Π_1$ transitions at 181.5 G and 217.1 G. We then compare the predicted transition dipole matrix elements from this model to those found for the transitions that have been successfully used for STIRAP at 181.5 G. We form molecules by magnetoassociation on a broad interspecies Feshbach resonance at 352.7 G and explore the pattern of Feshbach states near 305 G. This allows us to navigate to a suitable initial state for STIRAP by jumping across an avoided crossing with radiofrequency radiation. We identify suitable transitions for STIRAP at 305 G. We characterize these transitions experimentally and demonstrate STIRAP to a single hyperfine level of the ground state with a one-way efficiency of 85(4)%.
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