论文标题
来自förster耦合的跨维山谷激子在任意扭曲的单层半导体中
Cross-dimensional valley excitons from Förster coupling in arbitrarily twisted stacks of monolayer semiconductors
论文作者
论文摘要
在带有任意扭曲角度的过渡金属二进制二进制二进制单层中，我们探索了由明显的förster耦合引起的一类新的明亮激素，其尺寸是由其平面动量调节的。小动量的低能领域是二维的，具有墨西哥帽子的分散体，而较大动量的高能量部门变为三维（3D），平面内和平面外的群体速度相当大。通过选择间隔厚度的选择，在指定层上强烈定位的界面激子模式可以从拓扑来源的跨维体散布中出现。可以利用垫片中的台阶用于工程横向界面，以使拓扑接口激子的层间通信。结合从单层构建块继承的两极化选择规则，这些异国情调的激发剂特性为多层设计提供了新的机会，以朝着山谷激子光电的3D整合。
In stacks of transition metal dichalcogenide monolayers with arbitrary twisting angles, we explore a new class of bright excitons arising from the pronounced Förster coupling, whose dimensionality is tuned by its in-plane momentum. The low energy sector at small momenta is two-dimensional, featuring a Mexican Hat dispersion, while the high energy sector at larger momenta becomes three-dimensional (3D) with sizable group velocity both in-plane and out-of-plane. By choices of the spacer thickness, interface exciton mode strongly localized at designated layers can emerge out of the cross-dimensional bulk dispersion for a topological origin. Step-edges in spacers can be exploited for engineering lateral interfaces to enable interlayer communication of the topological interface exciton. Combined with the polarization selection rule inherited from the monolayer building block, these exotic exciton properties open up new opportunities for multilayer design towards 3D integration of valley exciton optoelectronics.
