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arXiv 2108.09268physics.atom-phquant-ph
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原子介质中近场诱导光自旋波退相的重整化群分析

Renormalization group analysis of near-field induced dephasing of optical spin waves in an atomic medium

Stefano Grava, Yizun He, Saijun Wu, Darrick E. Chang

摘要:

虽然原子-光相互作用的典型理论将原子介质视为光滑的,但众所周知,由原子粒度、偶极-偶极相互作用和多重散射驱动的微观光学效应可以导致重要的效应。最近,例如,实验观察到,这些成分可以导致无序原子介质中的光学自旋波的基本的、依赖于密度的退相。在这里,我们超越了以前考虑的短时间和稀释的限制,发展一个全面的理论,退相动力学的任意时间和原子密度。特别是,我们开发了一种新的,非微扰理论的基础上强无序重整化群,为了定量预测的主导作用,近场光学附近的邻居之间的相互作用,在驱动退相过程。这一理论也使人们能够捕捉的关键特征的多原子退相动力学的一个有效的单原子模型。这些结果将揭示近场相互作用对致密原子介质中量子光学现象的限制,并说明强无序重整化群作为处理此类系统中复杂微观光学现象的方法的前景。

英文摘要:

While typical theories of atom-light interactions treat the atomic medium as being smooth, it is well-known that microscopic optical effects driven by atomic granularity, dipole-dipole interactions, and multiple scattering can lead to important effects. Recently, for example, it was experimentally observed that these ingredients can lead to a fundamental, density-dependent dephasing of optical spin waves in a disordered atomic medium. Here, we go beyond the short-time and dilute limits considered previously, to develop a comprehensive theory of dephasing dynamics for arbitrary times and atomic densities. In particular, we develop a novel, non-perturbative theory based on strong disorder renormalization group, in order to quantitatively predict the dominant role that near-field optical interactions between nearby neighbors has in driving the dephasing process. This theory also enables one to capture the key features of the many-atom dephasing dynamics in terms of an effective single-atom model. These results should shed light on the limits imposed by near-field interactions on quantum optical phenomena in dense atomic media, and illustrate the promise of strong disorder renormalization group as a method of dealing with complex microscopic optical phenomena in such systems.

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