Superradiance and subradiance in inverted atomic arrays
Superradiance and subradiance in inverted atomic arrays
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DOI：
10.1103/physreva.106.053717
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发表时间：
2021-10
影响因子：
2.9
通讯作者：
Oriol Rubies-Bigorda;S. Yelin
中科院分区：
文献类型：
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作者：
Oriol Rubies-Bigorda;S. Yelin
超辐射和次辐射是量子发射体之间相干相互作用产生的集体效应。由于其多体性质，长度大于原子跃迁波长的扩展样品的理论研究通常局限于它们的早期行为或少激发极限。本文采用平均场方法将复杂的多体系统简化为一个有效的双原子主方程，该主方程包括所有到二阶的相关关系，并且可以在时间上进行数值传播。我们发现三维和二维倒立原子阵列维持超辐射低于临界晶格间距，并量化了两个维度的超辐射峰的缩放。最后，我们研究了系统的迟时动力学，证明了在系统最终松弛之前会出现一个副辐射相位。
Superradiance and subradiance are collective effects that emerge from coherent interactions between quantum emitters. Due to their many-body nature, theoretical studies of extended samples with length larger than the atomic transition wavelength are usually restricted to their early time behavior or to the few-excitation limit. We use herein a mean-field approach to reduce the complex many-body system to an effective two-atom master equation that includes all correlations up to second order and that can be numerically propagated in time. We find that three-dimensional and two-dimensional inverted atomic arrays sustain superradiance below a critical lattice spacing and quantify the scaling of the superradiant peak for both dimensionalities. Finally, we study the late-time dynamics of the system and demonstrate that a subradiant phase appears before the system finally relaxes.