近表面冷里德伯气体实验中的有害吸附质场
Detrimental adsorbate fields in experiments with cold Rydberg gases near surfaces
摘要：
我们观察到原子云在铜表面反复沉积时，靠近铜表面的铷原子的里德堡能级发生移动，并利用电磁感应透明技术测量了主量子数n在31 ~ 48之间的铷原子到S和D里德堡态的跃迁频率。光谱测量表明，随着原子的沉积，朝向表面的电场强烈增加。从一个干净的表面，我们测量的静电场的演变范围之间的30和300 \mum从表面。我们发现，在沉积了几百个原子云（每个原子云包含约10^6个原子）之后，吸附物的电场在距离表面30 \mum处达到1 V/cm。这种静电场的演化严重限制了原子芯片上里德伯原子的腔QED实验。
英文摘要：
We observe the shift of Rydberg levels of rubidium close to a copper surface when atomic clouds are repeatedly deposited on it. We measure transition frequencies of rubidium to S and D Rydberg states with principal quantum numbers n between 31 and 48 using the technique of electromagnetically induced transparency. The spectroscopic measurement shows a strong increase of electric fields towards the surface that evolves with the deposition of atoms. Starting with a clean surface, we measure the evolution of electrostatic fields in the range between 30 and 300 \mum from the surface. We find that after the deposition of a few hundred atomic clouds, each containing ~10^6 atoms, the field of adsorbates reaches 1 V/cm for a distance of 30 \mum from the surface. This evolution of the electrostatic field sets serious limitations on cavity QED experiments proposed for Rydberg atoms on atom chips.
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