论文标题
非磁性绝缘体中的固有自旋光钙化作用
Intrinsic Spin Photogalvanic Effect in Nonmagnetic Insulator
论文作者
论文摘要
我们表明，借助自旋轨道耦合，非线性光 - 物质相互作用可以有效地与自旋和山谷的自由度息息。这种揭示的自旋光钙化效应可以在非中心非对称非磁绝缘体中产生长期追求的内在纯自旋电流（PSC）。与自旋和山谷大厅效应不同，这种光驱动的自旋电流是通用的，并且可以在没有外部偏置场的情况下生成。使用第一原理模拟，我们研究了单层过渡金属二核苷（TMDS）来证明这种效果，并在线性极化的光激发下确认增强的PSC。 PSC的幅度比单层TMD中观察到的电荷电流大的一个阶。这种异国情调的非线性光旋转相互作用表明，可以将光用作操纵自旋偏振电流的快速方式，这对于将来的低衰减纳米电视至关重要。
We show that with the help of spin-orbit coupling, nonlinear light-matter interactions can efficiently couple with spin and valley degrees of freedom. This revealed spin photogalvanic effect can generate the long-time pursued intrinsic pure spin current (PSC) in non-centrosymmetric nonmagnetic insulators. Different from the spin and valley Hall effect, such a photo-driven spin current is universal and can be generated without external bias field. Using first-principles simulation, we study monolayer transition metal dichalcogenides (TMDs) to demonstrate this effect and confirm an enhanced PSC under linearly polarized photoexcitation. The amplitude of the PSC is one order larger than that of the charge current observed in monolayer TMDs. This exotic nonlinear light-spin interaction indicates that light can be utilized as a rapid fashion to manipulate the spin-polarized current, which is crucial for future low-dissipation nanodevices.
