标题： 观测和消除锶光晶格钟的直流斯塔克频移 显示英文标题

标题： Observation and cancellation of the dc Stark shift in strontium optical lattice clocks

摘要： 我们报告通过比较两个锶光晶格钟，观察到在$10^{-13}$能级上的直流斯塔克频率漂移。 这种频率漂移是由于在接近原子样品的真空环境下，电介质表面上存在电荷引起的。 我们表明，通过在电介质表面上照射紫外光可以消除这些电荷，并通过施加外部电场来表征在$10^{-18}$能级上时钟跃迁的剩余直流斯塔克频率漂移。 这项研究显示，直流斯塔克漂移可能在晶格钟的精度预算中起重要作用，应予以充分考虑。 显示英文摘要

摘要： We report on the observation of a dc Stark frequency shift at the $10^{-13}$ level by comparing two strontium optical lattice clocks. This frequency shift arises from the presence of electric charges trapped on dielectric surfaces placed under vacuum close to the atomic sample. We show that these charges can be eliminated by shining UV light on the dielectric surfaces, and characterize the residual dc Stark frequency shift on the clock transition at the $10^{-18}$ level by applying an external electric field. This study shows that the dc Stark shift can play an important role in the accuracy budget of lattice clocks, and should be duly taken into account.