High room temperature optical polarization due to spin-valley coupling in monolayer WS2

被引:22
|
作者
Hanbicki, A. T. [1 ]
McCreary, K. M. [1 ]
Kioseoglou, G. [2 ,3 ]
Currie, M. [4 ]
Hellberg, C. S. [1 ]
Friedman, A. L. [1 ]
Jonker, B. T. [1 ]
机构
[1] Naval Res Lab, Mat Sci & Technol Div, 4555 Overlook Ave SW, Washington, DC 20375 USA
[2] Univ Crete, Iraklion 71003, Greece
[3] Fdn Res & Technol Hellas FORTH, Inst Elect Struct & Laser IESL, Iraklion 71110, Greece
[4] Naval Res Lab, Opt Sci Div, 4555 Overlook Ave SW, Washington, DC 20375 USA
关键词
MOS2; GENERATION; EXCITONS;
D O I
10.1063/1.4942797
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We prepare single-layer WS2 films such that the photoluminescence is from either the neutral exciton or the negatively charged trion. While the neutral exciton emission has zero polarization at room temperature, we observe a room temperature optical polarization in excess of 40% for the trion. Using an applied gate voltage, we can modulate the electron density, and subsequently the polarization of the trion emission continuously from 20-40%. Both the polarization and the emission energy monotonically track the gate voltage with the emission energy increasing by 45 meV. We discuss the role electron capture by the exciton has on suppressing the intervalley scattering process. (C) 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
引用
收藏
页数:7
相关论文
共 50 条
  • [1] Anomalous temperature-dependent spin-valley polarization in monolayer WS2
    Hanbicki, A. T.
    Kioseoglou, G.
    Currie, M.
    Hellberg, C. Stephen
    McCreary, K. M.
    Friedman, A. L.
    Jonker, B. T.
    SCIENTIFIC REPORTS, 2016, 6
  • [2] Anomalous temperature-dependent spin-valley polarization in monolayer WS2
    A.T. Hanbicki
    G. Kioseoglou
    M. Currie
    C. Stephen Hellberg
    K.M. McCreary
    A.L. Friedman
    B.T. Jonker
    Scientific Reports, 6
  • [3] Robust room temperature valley polarization in monolayer and bilayer WS2
    Nayak, Pramoda K.
    Lin, Fan-Cheng
    Yeh, Chao-Hui
    Huang, Jer-Shing
    Chiu, Po-Wen
    NANOSCALE, 2016, 8 (11) : 6035 - 6042
  • [4] Ultrafast investigation of room temperature valley polarization in“optical bilayer” WS2
    ZHAO LeYi
    WANG Hai
    LIU TianYu
    LI FangFei
    ZHOU Qiang
    WANG HaiYu
    Science China Technological Sciences, 2024, 67 (01) : 91 - 97
  • [5] Ultrafast investigation of room temperature valley polarization in “optical bilayer” WS2
    LeYi Zhao
    Hai Wang
    TianYu Liu
    FangFei Li
    Qiang Zhou
    HaiYu Wang
    Science China Technological Sciences, 2024, 67 : 91 - 97
  • [6] Ultrafast investigation of room temperature valley polarization in "optical bilayer" WS2
    Zhao, LeYi
    Wang, Hai
    Liu, TianYu
    Li, FangFei
    Zhou, Qiang
    Wang, HaiYu
    SCIENCE CHINA-TECHNOLOGICAL SCIENCES, 2024, 67 (01) : 91 - 97
  • [7] Enhancement of Room-Temperature Photoluminescence and Valley Polarization of Monolayer and Bilayer WS2 via Chiral Plasmonic Coupling
    Liu, Gaohong
    Zheng, Xuanli
    Liu, Haiyang
    Yin, Jun
    Ke, Congming
    Yang, Weihuang
    Wu, Yaping
    Wu, Zhiming
    Li, Xu
    Zhang, Chunmiao
    Kang, Junyong
    ACS APPLIED MATERIALS & INTERFACES, 2021, 13 (29) : 35097 - 35104
  • [8] Persistent room-temperature valley polarization in graphite-filtered WS2 monolayer
    Demeridou, Ioanna
    Mavrotsoupakis, Emmanouil G.
    Mouchliadis, Leonidas
    Savvidis, Pavlos G.
    Stratakis, Emmanuel
    Kioseoglou, George
    2D MATERIALS, 2023, 10 (02)
  • [9] Anomalous enhancement of valley polarization in multilayer WS2 at room temperature
    Su, Huimin
    Wei, Chengrong
    Deng, Aiying
    Deng, Dongmei
    Yang, Chunlei
    Dai, Jun-Feng
    NANOSCALE, 2017, 9 (16) : 5148 - 5154
  • [10] Room Temperature Strong Coupling of Monolayer WS2 with Gold Nanoantennae
    Liu, Lin
    Tobing, Landobasa Y. M.
    Tong, Jinchao
    Zhang, Dao Hua
    Garcia-Vidal, Francisco J.
    Luo, Yu
    2017 PROGRESS IN ELECTROMAGNETICS RESEARCH SYMPOSIUM - FALL (PIERS - FALL), 2017, : 2578 - 2580