We investigate the effects of static electric and magnetic fields on the differential ac Stark shifts for microwave transitions in ultracold bosonic ${}^{87}\mathrm{Rb}{}^{133}\mathrm{Cs}$ molecules, for light of wavelength $\lambda =1064\mathrm{nm}$. Near this wavelength we observe unexpected two-photon transitions that may cause trap loss. We measure the ac Stark effect in external magnetic and electric fields, using microwave spectroscopy of the first rotational transition. We quantify the isotropic and anisotropic parts of the molecular polarizability at this wavelength. We demonstrate that a modest electric field can decouple the nuclear spins from the rotational angular momentum, greatly simplifying the ac Stark effect. We use this simplification to control the ac Stark shift using the polarization angle of the trapping laser.

中文翻译：

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用直流电场和磁场控制RbC的交流斯塔克效应

我们研究了静态电场和磁场对超冷硼酸中微波跃迁的微分交流斯塔克频移的影响。 ${}^{87}b{}^{133}\mathrm{Cs}$ 分子，用于波长的光 $\lambda =1064\mathrm{纳米}$。在此波长附近，我们观察到意外的双光子跃迁，这可能会导致陷阱损失。我们使用第一个旋转跃迁的微波光谱法测量外部磁场和电场中的ac Stark效应。我们在此波长下量化了分子极化率的各向同性和各向异性部分。我们证明，适度的电场可以使核自旋与旋转角动量解耦，从而大大简化了ac Stark效应。我们使用这种简化方法，使用陷波激光器的偏振角来控制ac Stark位移。