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Subradiance and superradiance-to-subradiance transition in dilute atomic clouds
Physical Review A ( IF 2.9 ) Pub Date : 
Diptaranjan Das, B. Lemberger, D. D. Yavuz

We experimentally study subradiance in a dilute cloud of ultracold rubidium (Rb) atoms where nλa3102 (n: atomic density, λa excitation wavelength) and the on-resonance optical depth of the cloud is of order unity. We show that in the strong excitation regime, the subradiant time-scales depend on the excitation fraction of the cloud; i.e., to the intensity of the excitation pulse. In this regime, the decay dynamics are highly complicated and there is not a single decay time-constant. Instead, the decay time constant varies during the dynamics. Specifically, we were able to observe signatures of superradiant-to-subradiant transition; i.e., initially the decay rate is faster than independent decay (superradiant emission), while at later times it transitions to slower (subradiant emission). We also discuss a theoretical model whose numerical results are in good agreement with the experiments.

中文翻译:

稀原子云中的亚辐射和超辐射到亚辐射的过渡

我们通过实验研究了超冷rub(Rb)原子的稀云中的亚辐射,其中 ñλ一种310-2ñ:原子密度, λ一种激发波长)和云的共振光学深度约为1阶。我们表明,在强激发态下,亚辐射时标取决于​​云层的激发分数。即,激发脉冲的强度。在这种情况下,衰减动力学非常复杂,并且没有一个衰减时间常数。取而代之的是,衰减时间常数在动态过程中会发生变化。具体而言,我们能够观察到超辐射到亚辐射过渡的特征。即,最初的衰减率比独立衰减(超辐射发射)快,而在随后的时间,它过渡到更慢(超辐射发射)。我们还讨论了一个理论模型,其数值结果与实验吻合良好。
更新日期:2020-09-22
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