点反射
凝聚态物理
单层
简并能级
原子轨道
材料科学
兴奋剂
电子
自旋(空气动力学)
不对称
自旋轨道相互作用
物理
联轴节(管道)
纳米技术
量子力学
热力学
冶金
作者
Kaiying Dou,Yandong Ma,Rui Peng,Wenhui Du,Baibiao Huang,Ying Dai
摘要
The valley degree of freedom of electrons in two-dimensional systems enables the unprecedented exploration of some physical properties as well as promising device applications. However, suitable two-dimensional valleytronic materials, especially with strong spin-valley coupling, are rare. In this work, based on first-principles calculations, we demonstrate a class of promising two-dimensional valleytronic materials in monolayer MN2X2 (M = Mo, W; X = F, H). Monolayer MN2X2 exhibits a semiconducting nature with the valence band maximum located at the K/K′ points, forming a pair of degenerate valleys. Importantly, upon including spin-orbital coupling, the valleys in these systems experience a significant spin splitting (601 meV), which gives rise to the long-sought strong spin-valley coupling. Such significant spin splitting is attributed to the strong spin–orbit coupling strength within the W-dx2−y2/dxy orbitals as well as the inversion asymmetry. Moreover, under hole doping and optical illumination, the valley Hall effect can be achieved in these systems.
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