标题： 电Breit-Rabi效应的观察 显示英文标题

标题： Observation of the electric Breit-Rabi Effect

摘要： 原子对外部电场和磁场的响应可以揭示基本的原子特性。 长期以来已证实，在静态磁场中，具有超精细相互作用的原子能级根据Breit-Rabi公式发生位移，该公式对磁场具有非线性依赖关系。 另一方面，由于实验上的挑战，之前尚未观察到对应的静态电场下的Breit-Rabi依赖关系。 在这里，我们精确测量了在静态电场高达120 kV/cm的情况下，由光学偶极 trap 保持的冷原子的$6s^2\ ^1S_0\ \leftrightarrow\ 6s6p\ ^1P_1$跃迁的斯塔克位移，其中$^{171}$Yb（$I$ = 1/2）。 我们观察到了显示高阶（$E^4$和$E^6$）直流斯塔克位移的电Breit-Rabi效应。 这些效应是强电场对超精细相互作用影响的结果。 显示英文摘要

摘要： The response of an atom to external electric and magnetic fields can reveal fundamental atomic properties. It has long been verified that, in a static magnetic field, those atomic energy levels with hyperfine interactions shift according to the Breit-Rabi formula, which introduces nonlinear dependence on the magnetic field. On the other hand, the corresponding Breit-Rabi dependence on a static electric field has not been observed before due to a combination of experimental challenges. Here we precisely measure the Stark shift of the $6s^2\ ^1S_0\ \leftrightarrow\ 6s6p\ ^1P_1$ transition of $^{171}$Yb ($I$ = 1/2) with cold atoms held by an optical dipole trap in a static electric field up to 120 kV/cm. We observe the electric Breit-Rabi effect displaying high-order ($E^4$ and $E^6$) DC Stark shifts. These effects arise from the influence of the strong electric field on hyperfine interactions.