论文标题
范德华（Van der Waals
Van der Waals dephasing for Dicke subradiance in cold atomic clouds
论文作者
论文摘要
我们以数值方式研究了近场偶极 - 偶极相互作用在由弱场驱动的大无序冷原子样品的晚期发射动力学上的作用。宏观样品中亚缩度的先前实验和数值研究集中在没有内部结构的纯度两级原子的低密度样品上，这与光的标量表示相对应。然后，光的晚期发射的合作性由共振的光学深度控制。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本中合作的有害作用。观察到的次化寿命的降低被解释为由于近场贡献而导致的不均匀扩展的标志，类似于范德华（Van der waals）的超负增长现象。
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.
