AI 中文总结
研究通过二维西西弗斯激光冷却方法，使加载到磁光阱的SrOH分子数量增加12倍，再加载到ODT实现超冷分子捕获，该冷却方法普遍适用，有助于超轻暗物质搜索等多方面量子科学研究。
AI 中文摘要
我们展示了一种二维西西弗斯激光冷却方法，该方法使加载到磁光阱中的氢氧化锶（SrOH）分子数量增加了12倍。随后将其加载到光学偶极阱（ODT）中，可实现$2.2 (3)\times10^4$个超冷SrOH分子，峰值密度约为$\sim2(1)\times10^{10}~\mathrm{cm^{-3}}$。分子在ODT中的寿命受两体碰撞限制，测得的碰撞速率常数$\beta \sim 4\times10^{-10}~\mathrm{cm^3/s}$。这里开发的冷却方法普遍适用于所有已知的直接分子激光冷却情况。捕获分子数量的增加将直接改善对超轻暗物质的搜索等。
英文摘要
We demonstrate a two-dimensional Sisyphus laser cooling method that increases the number of strontium monohydroxide (SrOH) molecules loaded into a magneto-optical trap by a factor of 12. Subsequent loading into an optical dipole trap (ODT) achieves $2.2 (3)\times10^4$ ultracold SrOH molecules with a peak density of $\sim2(1)\times10^{10}~\mathrm{cm^{-3}}$. The lifetime of molecules in the ODT is limited by two-body collisions characterized by a measured collision rate constant $β\sim 4\times10^{-10}~\mathrm{cm^3/s}$. The cooling method developed here is generally applicable to all known cases of direct molecular laser cooling, including symmetric and asymmetric top molecules. Increases in trapped molecule number will directly improve the search for ultralight dark matter, position polyatomic molecules as a platform for probing CP-violating new particles with masses $\gg$10 TeV, and facilitate a broad range of further research in quantum science.
