Valleytronics公司
电场
极化(电化学)
物理
激子
联轴节(管道)
光电子学
光学
材料科学
凝聚态物理
铁磁性
量子力学
化学
物理化学
冶金
自旋电子学
作者
Zhi‐Ming Yu,Shan Guan,Xian‐Lei Sheng,Weibo Gao,Shengyuan A. Yang
标识
DOI:10.1103/physrevlett.124.037701
摘要
The current valleytronics research is based on the paradigm of time-reversal-connected valleys in two-dimensional (2D) hexagonal materials, which forbids the fully electric generation of valley polarization by a gate field. Here, we go beyond the existing paradigm to explore 2D systems with a novel valley-layer coupling (VLC) mechanism, where the electronic states in the emergent valleys have a valley-contrasted layer polarization. The VLC enables a direct coupling between a valley and a gate electric field. We analyze the symmetry requirements for a system to host VLC, demonstrate our idea via first-principles calculations and model analysis of a concrete 2D material example, and show that an electric, continuous, wide-range, and switchable control of valley polarization can be achieved by VLC. Furthermore, we find that systems with VLC can exhibit other interesting physics, such as valley-contrasting linear dichroism and optical selection of the valley and the electric polarization of interlayer excitons. Our finding opens a new direction for valleytronics and 2D materials research.
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