论文标题
稀释原子合奏中的次级亚品质：对和多个散射的作用
Subradiance in dilute atomic ensembles: Role of pairs and multiple scattering
论文作者
论文摘要
我们从数值上研究弱脉冲激发后一动原子荧光的慢速（次化）衰变。我们表明，在线性启发式方案中，对于因几个自然线宽而引起的激发，缓慢的衰减速率可以由近距离原子（二聚体）形成级数和次值态的近对主导。但是，对于大型谐振的光学深度，在以后，该动力学以集体多体效应为主。在这个方案中，我们研究了发射光的极化和光谱以及样品内部激发的空间分布，这是衰减动力学期间时间的函数。这些可观察物的行为与几乎共鸣光的辐射诱捕期望是一致的。这一发现通过基于系统的光行为（多个散射）提供解释，从而阐明了稀释样品中的亚缩影，该解释与集体原子Dicke State的更常用图片相辅相成。
We study numerically the slow (subradiant) decay of the fluorescence of motionless atoms after a weak pulsed excitation. We show that, in the linear-optics regime and for an excitation detuned by several natural linewidths, the slow decay rate can be dominated by close pairs of atoms (dimers) forming superradiant and subradiant states. However, for a large-enough resonant optical depth and at later time, the dynamics is dominated by collective many-body effects. In this regime, we study the polarization and the spectrum of the emitted light, as well as the spatial distribution of excitation inside the sample, as a function of time during the decay dynamics. The behavior of these observables is consistent with what would be expected for radiation trapping of nearly resonant light. This finding sheds light on subradiance in dilute samples by providing an interpretation based on the light behavior of the system (multiple scattering) which is complementary to the more commonly used picture of the collective atomic Dicke state.
