Electrical tuning of valley polarization in monolayer transition metal dichalcogenides

被引:5
|
作者
Zhang, Qing-Qing [1 ,2 ]
An, Xing -Tao [1 ,3 ,4 ]
Liu, Jian-Jun [1 ,5 ]
机构
[1] Hebei Normal Univ, Coll Phys, Shijiazhuang 050024, Peoples R China
[2] Cangzhou Normal Univ, Dept Phys & Informat Engn, Cangzhou 061001, Peoples R China
[3] Hebei Univ Sci & Technol, Sch Sci, Hebei Prov Key Lab Photoelect Control Surface & In, Shijiazhuang 050018, Peoples R China
[4] Yanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Peoples R China
[5] Shijiazhuang Univ, Dept Phys, Shijiazhuang 050035, Peoples R China
关键词
MOS2; SPIN; GENERATION; TRANSPORT;
D O I
10.1103/PhysRevB.107.035411
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The valley degree of freedom in two-dimensional crystalline materials is another promising candidate for de-signing dissipationless information devices in addition to the spin degree of freedom. The primary challenge for the application of valley degree of freedom is to achieve a significant and controllable valley polarization. Here, we discover an electrical tunable mechanism for generating valley polarization caused by the backscattering induced by Rashba spin-orbit coupling in monolayer nanoribbon of transition-metal dichalcogenides. Since the Rashba spin-orbit coupling in monolayer transition-metal dichalcogenides can be induced by the external electric field, the valley polarization here can be dynamically controlled by means of the external gating. The results of the valley-dependent transport calculations show that a pronounced valley polarization can be generated when the external electric field-induced Rashba spin-orbit coupling is present in the central scattering region of the nanoribbon. Moreover, the efficiency and direction of the valley polarization can be controlled by tuning the Fermi energy and the strength of Rashba spin-orbit coupling. The calculated results also confirm that the valley polarization remains significant in the presence of atomic vacancy defects. This finding opens up a potential possibility for realizing electrical control of the valleytronics devices.
引用
收藏
页数:10
相关论文
共 50 条
  • [1] Selective control of valley polarization in monolayer transition metal dichalcogenides among multiexcitonic states
    Liang, Lun
    Yang, Di
    Liu, Wen
    Qu, Fanyao
    Hao, Ning
    Zhang, Ping
    Fu, Jiyong
    APPLIED PHYSICS LETTERS, 2024, 125 (13)
  • [2] Electrical valley filtering in transition metal dichalcogenides
    Hsieh, Tzu-Chi
    Chou, Mei-Yin
    Wu, Yu-Shu
    PHYSICAL REVIEW MATERIALS, 2018, 2 (03):
  • [3] Chirality of Valley Excitons in Monolayer Transition-Metal Dichalcogenides
    Caruso, Fabio
    Schebek, Maximilian
    Pan, Yiming
    Vona, Cecilia
    Draxl, Claudia
    JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 2022, 13 (25): : 5894 - 5899
  • [4] Valley Edelstein effect in monolayer transition-metal dichalcogenides
    Taguchi, K.
    Zhou, B. T.
    Kawaguchi, Y.
    Tanaka, Y.
    Law, K. T.
    PHYSICAL REVIEW B, 2018, 98 (03)
  • [5] Exciton valley depolarization in monolayer transition-metal dichalcogenides
    Yang, Min
    Robert, Cedric
    Lu, Zhengguang
    Dinh Van Tuan
    Smirnov, Dmitry
    Marie, Xavier
    Dery, Hanan
    PHYSICAL REVIEW B, 2020, 101 (11)
  • [6] Bias-driven spontaneous spin-valley polarization in monolayer transition-metal dichalcogenides
    Semenov, Yuriy G.
    Kim, Ki Wook
    PHYSICAL REVIEW B, 2016, 93 (04)
  • [7] Optical Control of Spin Polarization in Monolayer Transition Metal Dichalcogenides
    Chen, Xi
    Yan, Tengfei
    Zhu, Bairen
    Yang, Siyuan
    Cui, Xiaodong
    ACS NANO, 2017, 11 (02) : 1581 - 1587
  • [8] Strongly distinct electrical response between circular and valley polarization in bilayer transition metal dichalcogenides
    Du, Luojun
    Liao, Mengzhou
    Liu, Gui-Bin
    Wang, Qinqin
    Yang, Rong
    Shi, Dongxia
    Yao, Yugui
    Zhang, Guangyu
    PHYSICAL REVIEW B, 2019, 99 (19)
  • [9] Inverted valley polarization in optically excited transition metal dichalcogenides
    Gunnar Berghäuser
    Ivan Bernal-Villamil
    Robert Schmidt
    Robert Schneider
    Iris Niehues
    Paul Erhart
    Steffen Michaelis de Vasconcellos
    Rudolf Bratschitsch
    Andreas Knorr
    Ermin Malic
    Nature Communications, 9
  • [10] Dark excitons and the elusive valley polarization in transition metal dichalcogenides
    Baranowski, M.
    Surrente, A.
    Maude, D. K.
    Ballottin, M.
    Mitioglu, A. A.
    Christianen, P. C. M.
    Kung, Y. C.
    Dumcenco, D.
    Kis, A.
    Plochocka, P.
    2D MATERIALS, 2017, 4 (02):