水平入射圆偏振光对双层石墨烯异质结构的调谐
Tuning of Bilayer Graphene Heterostructure by Horizontally Incident Circular Polarized Light
摘要：
理论研究了水平圆偏振光照射下双层石墨烯异质结构的Floquet态。光的面内和面外电场分别周期性地扰动层内和层间跳跃。对于圆偏振光，电场的两个分量具有$π/2$相位差，使得两种类型的跳跃被$π/2$相位差周期性地扰动，这修改了有效的层间跳跃。我们重点研究了反铁磁范德华自旋阀异质结构中的双层石墨烯模型。辐照的幅度可以调节体态的带隙和拓扑性质。预言了自旋极化的量子反常Hall相位，其Chern数为1。照射的入射角可以调节锯齿形纳米带的带隙和边缘态的色散。
英文摘要：
We theoretically investigated the Floquet states of bilayer graphene heterostructure under the irradiation by horizontally incident circular polarized light. The in-plane and out-of-plane electric field of the light periodically perturbs the intra-layer and inter-layer hopping, respectively. For circular polarized light, the two components of the electric field has $π/2$ phase difference, so that the two types of hopping are periodically perturbed with the $π/2$ phase difference, which modify the effective inter-layer hopping. We focus on the model of bilayer graphene in the heterostructure of antiferromagnetic van der Walls spin valve. The amplitude of the irradiation can tune the band gap and topological properties of the bulk state. The spin-polarized quantum anomalous Hall phase with Chern number being one is predicted. The incident angle of the irradiation can tune the band gap and dispersion of the edge states in zigzag nanoribbons.
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