We discuss the generation of a spin current by an edge plasmon in a graphene ribbon, which is a kind of surface plasmon that is localized near the edges of the ribbon. In contrast with a surface plasmon on the surface of a three-dimensional metal, the electric field of the edge plasmon rotates as a function of the time in the plane of graphene, which means that the optical spin-angular momentum of the edge plasmon is out of plane. We found that the electric-field-induced spin current flows by the inverse Faraday effect between the edges of the ribbon with spin polarization of electrons in the out-of-plane direction. The symmetric mode of the edge plasmon gives a larger magnitude of the spin current than the antisymmetric mode does. Moreover, the magnitude and direction of the spin current are tunable not only by the frequency of the edge plasmon, but also by the Fermi energy of graphene, which enables application to a spin-switching device controlled by a gate voltage.

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通过石墨烯带中的边缘等离子体激元产生自旋电流

我们讨论了石墨烯带中的边缘等离子体激元产生自旋电流，这是一种位于带边缘附近的表面等离子体激元。与三维金属表面的表面等离子体相比，边缘等离子体的电场在石墨烯平面内随时间旋转，这意味着边缘等离子体的光学自旋角动量为出飞机。我们发现电场诱导的自旋电流通过带边缘之间的反法拉第效应流动，电子在面外方向自旋极化。边缘等离子体的对称模式比反对称模式提供更大的自旋电流幅值。此外，自旋流的大小和方向不仅可以通过边缘等离子体的频率进行调节，