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arXiv 2203.07754physics.atom-ph
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工程化分子磁光阱中的亚多普勒力

Engineering the sub-Doppler force in molecular magneto-optical traps

S. Xu, P. Kaebert, M. Stepanova, T. Poll, M. Siercke, S. Ospelkaus

AI总结:

针对超冷分子双频磁光阱的亚多普勒加热问题,理论上证明可工程化该效应实现冷却,通过CaF分子的光学Bloch方程与三维Monte Carlo模拟验证了冷却效果并估算了温度与密度。

摘要:

当前用于超冷分子的双频磁光阱受到亚多普勒加热效应的困扰,使其远不如标准原子MOT。在此我们从理论上证明,此类MOT中的亚多普勒效应可被工程化以提供冷却而非加热。我们给出了实现这种冷却的直观图像,并展示了CaF分子情况下16能级光学Bloch方程的冷却与陷俘力结果。通过三维Monte Carlo模拟,我们估计对于$10^5$的分子数,MOT的温度和密度分别为$40 μK$和$4 \ imes 10^8 cm^{-3}$。

英文摘要:

Current dual-frequency magneto-optical traps for ultracold molecules are plagued by sub-Doppler heating effects, making them vastly inferior to standard atomic MOTs. Here we demonstrate theoretically that the sub-Doppler effects in such a MOT can be engineered to provide cooling instead of heating. We give an intuitive picture how to achieve such cooling and show the cooling and trapping force results of the 16 level optical Bloch equations for the case of CaF molecules. From three-dimensional Monte Carlo simulations we estimate the temperature and density of our MOT to be $40 μK$ and $4 \times 10^8 cm^{-3}$ respectively for a molecule number of $10^5$.

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