Ultrafast valley relaxation dynamics in monolayer MoS2 probed by nonequilibrium optical techniques

被引：87
|
作者：
Dal Conte, S. [1 ,2 ]
Bottegoni, F. [2 ]
Pogna, E. A. A. [2 ]
De Fazio, D. [3 ]
Ambrogio, S. [4 ,5 ]
Bargigia, I. [6 ]
D'Andrea, C. [2 ,6 ]
Lombardo, A. [3 ]
Bruna, M. [3 ]
Ciccacci, F. [2 ]
Ferrari, A. C. [3 ]
Cerullo, G. [1 ,2 ]
Finazzi, M. [2 ]
机构：
[1] IFN CNR, I-20133 Milan, Italy
[2] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy
[3] Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England
[4] Politecn Milan, Dipartimento Elettron Informat & Bioingn, I-20133 Milan, Italy
[5] IU NET, I-20133 Milan, Italy
[6] Ist Italiano Tecnol, Ctr Nano Sci & Technol PoliMi, I-20133 Milan, Italy
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 23期
基金：
英国工程与自然科学研究理事会;
关键词：
POLARIZATION; LIFETIMES; GRAPHENE;
D O I：
10.1103/PhysRevB.92.235425
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the exciton valley relaxation dynamics in single-layerMoS(2) by a combination of two nonequilibrium optical techniques: time-resolved Faraday rotation and time-resolved circular dichroism. The depolarization dynamics, measured at 77 K, exhibits a peculiar biexponential decay, characterized by two distinct time scales of 200 fs and 5 ps. The fast relaxation of the valley polarization is in good agreement with a model including the intervalley electron-hole Coulomb exchange as the dominating mechanism. The valley relaxation dynamics is further investigated as a function of temperature and photoinduced exciton density. We measure a strong exciton density dependence of the transient Faraday rotation signal. This indicates the key role of exciton-exciton interactions in MoS2 valley relaxation dynamics.
引用
收藏
页数：6
相关论文
共 50 条
  • [31] Valley Polarization in Superacid-Treated Monolayer MoS2
    Li, Ruijie
    Li, Yifei
    Tian, Huifeng
    Liao, PeiChi
    Wang, Hanyu
    Zhang, Shengnan
    Yao, Zhixin
    Wang, Haicheng
    Liu, Shizhuo
    Chen, Guanwei
    Yu, Shulei
    Li, Zhenjiang
    Liu, Junjiang
    Xu, Zhi
    Mei, Fuhong
    Liu, Peizhi
    Guo, Junjie
    Liu, Kaihui
    Li, Xiao
    Liu, Lei
    [J]. ACS APPLIED ELECTRONIC MATERIALS, 2020, 2 (07): : 1981 - 1988
  • [32] Giant valley drifts in uniaxially strained monolayer MoS2
    Zhang, Qingyun
    Cheng, Yingchun
    Gan, Li-Yong
    Schwingenschloegl, Udo
    [J]. PHYSICAL REVIEW B, 2013, 88 (24)
  • [33] Piezotronic spin and valley transistors based on monolayer MoS2
    Liu, Ruhao
    Hu, Gongwei
    Dan, Minjiang
    Zhang, Yaming
    Li, Lijie
    Zhang, Yan
    [J]. NANO ENERGY, 2020, 72
  • [34] Imaging the valley and orbital Hall effect in monolayer MoS2
    Xue, Fei
    Amin, Vivek
    Haney, Paul M.
    [J]. PHYSICAL REVIEW B, 2020, 102 (16)
  • [35] Valley- and spin-filter in monolayer MoS2
    Majidi, Leyla
    Zare, Moslem
    Asgari, Reza
    [J]. SOLID STATE COMMUNICATIONS, 2014, 199 : 52 - 55
  • [36] Valley qubit in a gated MoS2 monolayer quantum dot
    Pawlowski, J.
    Zebrowski, D.
    Bednarek, S.
    [J]. PHYSICAL REVIEW B, 2018, 97 (15)
  • [37] Exciton valley dynamics in monolayer WSe2 probed by the two-color ultrafast Kerr rotation
    Yan, Tengfei
    Ye, Jialiang
    Qiao, Xiaofen
    Tana, Pingheng
    Zhang, Xinhui
    [J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2017, 19 (04) : 3176 - 3181
  • [38] Strain relaxation in monolayer MoS2 over flexible substrate
    Basu, Nilanjan
    Kumar, Ravindra
    Manikandan, D.
    Dastidar, Madhura Ghosh
    Hedge, Praveen
    Nayak, Pramoda K.
    Bhallamudi, Vidya Praveen
    [J]. RSC ADVANCES, 2023, 13 (24) : 16241 - 16247
  • [39] Ultrafast laser pulse induced topological resonance in MoS2 monolayer
    Motlagh, S. A. Oliaei
    Wu, J. S.
    Apalkov, V.
    Stockman, M.
    [J]. 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2019,
  • [40] Ultrafast transient sub-bandgap absorption of monolayer MoS2
    Das, Susobhan
    Wang, Yadong
    Dai, Yunyun
    Li, Shisheng
    Sun, Zhipei
    [J]. LIGHT-SCIENCE & APPLICATIONS, 2021, 10 (01)
12345