Valleytronics公司
纳米光子学
激子
纳米结构
电子
纳米线
材料科学
电场
光子
联轴节(管道)
物理
光电子学
纳米技术
凝聚态物理
光学
自旋电子学
量子力学
铁磁性
冶金
作者
Li Zheng,Zhibo Dang,Dongdong Ding,Zhixin Liu,Yuchen Dai,Jianming Lü,Zheyu Fang
标识
DOI:10.1002/adma.202204908
摘要
Abstract Valleytronics in 2D transition metal dichalcogenides has raised a great impact in nanophotonic information processing and transport as it provides the pseudospin degree of freedom for carrier control. The imbalance of carrier occupation in inequivalent valleys can be achieved by external stimulations such as helical light and electric field. With metasurfaces, it is feasible to separate the valley exciton in real space and momentum space, which is significant for logical nanophotonic circuits. However, the control of valley‐separated far‐field emission by a single nanostructure is rarely reported, despite the fact that it is crucial for subwavelength research of valley‐dependent directional emission. Here, it is demonstrated that the electron beam permits the chirality‐selective routing of valley photons in a monolayer WS 2 with Au nanostructures. The electron beam can locally excite valley excitons and regulate the coupling between excitons and nanostructures, hence controlling the interference effect of multipolar electric modes in nanostructures. Therefore, the separation degree can be modified by steering the electron beam, exhibiting the capability of subwavelength control of valley separation. This work provides a novel method to create and resolve the variation of valley emission distribution in momentum space, paving the way for the design of future nanophotonic integrated devices.
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