论文标题
光子石墨烯中的自旋轨道耦合
Spin-orbit coupling in photonic graphene
论文作者
论文摘要
我们使用电磁诱导的透明度在原子蒸气细胞中在实验中生成蜂窝折射率模式。我们从实验和理论上研究了这种“光子石墨烯”中极化光束的繁殖。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是对近似束方程的校正。它导致在石墨烯晶格的零点上自旋和角动量的耦合。我们的结果表明，极化程度在以前忽略的许多配置中起着重要作用。
We generate experimentally a honeycomb refractive index pattern in an atomic vapor cell using electromagnetically-induced transparency. We study experimentally and theoretically the propagation of polarized light beams in such "photonic graphene". 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 plays an important role in many configurations where it has been previously neglected.
