激子
凝聚态物理
塞曼效应
Valleytronics公司
单层
自旋(空气动力学)
物理
极化(电化学)
电子
有效质量(弹簧-质量系统)
材料科学
磁场
化学
铁磁性
纳米技术
自旋电子学
量子力学
热力学
物理化学
作者
Yaqian Wang,Longjiang Deng,Qilin Wei,Yi Wan,Zhen Liu,Xiao Lu,Yue Li,Lei Bi,Li Zhang,Haipeng Lu,Haiyan Chen,Peiheng Zhou,Yingchun Cheng,Xiaoxu Zhao,Yu Ye,Wei Huang,Stephen J. Pennycook,Kian Ping Loh,Bo Peng
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-02-20
卷期号:20 (3): 2129-2136
被引量:61
标识
DOI:10.1021/acs.nanolett.0c00138
摘要
Valley pseudospin in two-dimensional (2D) transition-metal dichalcogenides (TMDs) allows optical control of spin-valley polarization and intervalley quantum coherence. Defect states in TMDs give rise to new exciton features and theoretically exhibit spin-valley polarization; however, experimental achievement of this phenomenon remains challenges. Here, we report unambiguous valley pseudospin of defect-bound localized excitons in CVD-grown monolayer MoS2; enhanced valley Zeeman splitting with an effective g-factor of -6.2 is observed. Our results reveal that all five d-orbitals and the increased effective electron mass contribute to the band shift of defect states, demonstrating a new physics of the magnetic responses of defect-bound localized excitons, strikingly different from that of A excitons. Our work paves the way for the manipulation of the spin-valley degrees of freedom through defects toward valleytronic devices.
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