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Spin–orbit coupling in photonic graphene
Optica ( IF 10.4 ) Pub Date : 2020-05-06 , DOI: 10.1364/optica.390386
Zhaoyang Zhang , Shun Liang , Feng Li , Shaohuan Ning , Yiming Li , Guillaume Malpuech , Yanpeng Zhang , Min Xiao , Dmitry Solnyshkov

Spin–orbit coupling of electromagnetic waves is one of the most important effects in topological photonics, but so far it has not been studied in photonic graphene implementations based on paraxial configuration, in particular, in atomic vapor cells. We generate experimentally a honeycomb refractive index pattern in such a cell using electromagnetically induced transparency. We demonstrate that an effective spin–orbit coupling appears as a correction to the paraxial beam equations because of the strong spatial gradients of the permittivity. It leads to the coupling of spin and angular momentum at the Dirac points of the graphene lattice. Our results suggest that the polarization degree of freedom plays an important role in many configurations where it has been previously neglected.

中文翻译:

光子石墨烯的自旋-轨道耦合

电磁波的自旋轨道耦合是拓扑光子学中最重要的影响之一,但到目前为止,尚未在基于近轴构型的光子石墨烯实现中,特别是在原子蒸气池中进行研究。我们在实验中使用电磁感应的透明度在此单元格中生成蜂窝折射率图案。我们证明,由于介电常数的强空间梯度,有效的自旋轨道耦合似乎可以作为近轴光束方程的校正。它导致了石墨烯晶格的狄拉克点处自旋和角动量的耦合。我们的结果表明,极化自由度在许多先前被忽略的配置中起着重要作用。
更新日期:2020-05-06
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