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

页数：6

共 50 条

[41] Ultrafast charge dynamics and photoluminescence in bilayer MoS2
Ud Din, Naseem
Turkowski, Volodymyr
Rahman, Talat S.
[J]. 2D MATERIALS, 2021, 8 (02)
[42] Observation of Rich Defect Dynamics in Monolayer MoS2
Ravichandran, Harikrishnan
Knobloch, Theresia
Pannone, Andrew
Karl, Alexander
Stampfer, Bernhard
Waldhoer, Dominic
Zheng, Yikai
Sakib, Najam U.
Sadaf, Muhtasim Ul Karim
Pendurthi, Rahul
Torsi, Riccardo
Robinson, Joshua A. A.
Grasser, Tibor
Das, Saptarshi
[J]. ACS NANO, 2023, 17 (15) : 14449 - 14460
[43] Ultrafast transient sub-bandgap absorption of monolayer MoS2
Susobhan Das
Yadong Wang
Yunyun Dai
Shisheng Li
Zhipei Sun
[J]. Light: Science & Applications, 10
[44] Ultrafast mid-infrared intraexcitonic spectroscopy of monolayer MoS2
Cha, Soonyoung
Sung, Ji Ho
Kim, Jooyoun
Sim, Sangwan
Jo, Moon-Ho
Choi, Hyunyong
[J]. 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), 2015,
[45] Optical Second Harmonic Generation in Monolayer MoS2
Wu, Qingxiong
Jiang, Tian
Wei, Ke
[J]. LIDAR IMAGING DETECTION AND TARGET RECOGNITION 2017, 2017, 10605
[46] Electronic Structure and Optical Properties of Monolayer MoS2
Lei Tianmin
Wu Shengbao
Zhang Yuming
Liu Jiajia
Guo Hui
Zhang Zhiyong
[J]. RARE METAL MATERIALS AND ENGINEERING, 2013, 42 (12) : 2477 - 2480
[47] Broadband optical properties of monolayer and bulk MoS2
Ermolaev, Georgy A.
Stebunov, Yury, V
Vyshnevyy, Andrey A.
Tatarkin, Dmitry E.
Yakubovsky, Dmitry, I
Novikov, Sergey M.
Baranov, Denis G.
Shegai, Timur
Nikitin, Alexey Y.
Arsenin, Aleksey, V
Volkov, Valentyn S.
[J]. NPJ 2D MATERIALS AND APPLICATIONS, 2020, 4 (01)
[48] Optical properties of charged defects in monolayer MoS2
Aghajanian, Martik
Mostofi, Arash A.
Lischner, Johannes
[J]. ELECTRONIC STRUCTURE, 2023, 5 (04):
[49] Broadband optical properties of monolayer and bulk MoS2
Georgy A. Ermolaev
Yury V. Stebunov
Andrey A. Vyshnevyy
Dmitry E. Tatarkin
Dmitry I. Yakubovsky
Sergey M. Novikov
Denis G. Baranov
Timur Shegai
Alexey Y. Nikitin
Aleksey V. Arsenin
Valentyn S. Volkov
[J]. npj 2D Materials and Applications, 4
[50] Substrate Induced Optical Anisotropy in Monolayer MoS2
Shen, Wanfu
Wei, Yaxu
Hu, Chunguang
Lopez-Posadas, C. B.
Hohage, Michael
Sun, Lidong
[J]. JOURNAL OF PHYSICAL CHEMISTRY C, 2020, 124 (28): : 15468 - 15473

← 1 2 3 4 5 →