论文标题
由表面等离子体polariton驱动的电子自旋传输
Electron spin transport driven by surface plasmon polariton
论文作者
论文摘要
我们提出了一种从表面等离子体偏振子（SPP）中的角横向自旋到传导电子自旋的角动量转化的机制。金属中的自由电子遵循SPP的横向旋转电场，所得的轨道运动在金属中造成了不均匀的静态磁化。通过求解SPP中的自旋扩散方程，我们发现磁化场会产生电子自旋电流。我们表明，存在共振的旋转状态，其中旋转电流得到了共振的增强，并且旋转电流的极化被拨动。我们的理论揭示了SPP作为自旋电流源的新功能。
We propose a mechanism of angular momentum conversion from optical transverse spin in surface plasmon polaritons (SPPs) to conduction electron spin. Free electrons in the metal follow the transversally spinning electric field of SPP, and the resulting orbital motions create inhomogeneous static magnetisation in the metal. By solving the spin diffusion equation in the SPP, we find that the magnetisation field generates an electron spin current. We show that there exists a resonant condition where the spin current is resonantly enhanced, and the polarisation of the spin current is flipped. Our theory reveals a novel functionality of SPP as a spin current source.
