论文标题
使用底物引起的Rashba旋转轨耦合对石墨烯的光保护旋转大厅效应
Photoprotected spin Hall effect on graphene with substrate induced Rashba spin-orbit coupling
论文作者
论文摘要
我们提出了石墨烯中旋转厅效应的实验实现，它通过用圆极化的单色光照亮石墨烯片。底物诱导可控的Rashba型自旋轨道耦合，从而破坏了Dirac锥的自旋排放元，但它是无间隙的。圆极化的光引起光谱中的间隙，并将石墨烯变成具有旋转依赖边缘状态的浮光拓扑绝缘子。通过分析高和中间的频率状态，我们发现在两个参数限制中，可以通过电荷颗粒的有效耦合强度到辐射场来调节自旋数字，并确定光诱导的拓扑相变的条件。
We propose an experimental realization of the Spin Hall effect in graphene by illuminating a graphene sheet on top of a substrate with circularly polarized monochromatic light. The substrate induces a controllable Rashba type spin-orbit coupling which breaks the spin-degeneracy of the Dirac cones but it is gapless. The circularly polarized light induces a gap in the spectrum and turns graphene into a Floquet topological insulator with spin dependent edge states. By analyzing the high and intermediate frequency regimes, we find that in both parameter limits, the spin-Chern number can be tuned by the effective coupling strength of the charge particles to the radiation field and determine the condition for the photoinduced topological phase transition.
