冷原子云中Dicke次辐射的范德瓦尔斯退相
Van der Waals dephasing for Dicke subradiance in cold atomic clouds
摘要：
我们用数值方法研究了近场偶极-偶极相互作用对大尺寸无序冷原子在弱场驱动下的晚期发射动力学的影响。以前的实验和数值研究亚辐射在宏观样品集中在低密度样品的纯二能级原子，没有内部结构，这对应于一个标量表示的光。然后，光的后期发射的合作性质由共振光学深度决定。在这里，通过考虑光的矢量性质，我们显示了近场项在高密度样品中对协同性的不利作用。在subradiant寿命的观察到的减少被解释为由于近场的贡献，在类比与超辐射的范德华失相现象的非均匀加宽的签名。
英文摘要：
We investigate numerically the role of near-field dipole-dipole interactions on the late emission dynamics of large disordered cold atomic samples driven by a weak field. Previous experimental and numerical studies of subradiance in macroscopic samples have focused on low-density samples of pure two-level atoms, without internal structure, which corresponds to a scalar representation of the light. The cooperative nature of the late emission of light is then governed by the resonant optical depth. Here, by considering the vectorial nature of the light, we show the detrimental role of the near-field terms on cooperativity in higher-density samples. The observed reduction in the subradiant lifetimes is interpreted as a signature of the inhomogeneous broadening due to the near-field contributions, in analogy with the Van der Waals dephasing phenomenon for superradiance.
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