Spin depolarization dynamics of WSe2 bilayer

doi:10.1088/1674-1056/27/5/057202

中国物理B ›› 2018, Vol. 27 ›› Issue (5): 57202-057202.doi: 10.1088/1674-1056/27/5/057202

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Spin depolarization dynamics of WSe₂ bilayer

Binghui Niu(牛秉慧), Jialiang Ye(叶加良), Ting Li(李婷), Ying Li(李莹), Xinhui Zhang(张新惠)

1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2018-01-15 修回日期:2018-02-14 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: Xinhui Zhang E-mail:xinhuiz@semi.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No.11474276) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDPB0603).

Spin depolarization dynamics of WSe₂ bilayer

Binghui Niu(牛秉慧)^1,2, Jialiang Ye(叶加良)^1,2, Ting Li(李婷)^1,2, Ying Li(李莹)^1,2, Xinhui Zhang(张新惠)^1,2

1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-01-15 Revised:2018-02-14 Online:2018-05-05 Published:2018-05-05
Contact: Xinhui Zhang E-mail:xinhuiz@semi.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No.11474276) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDPB0603).

摘要/Abstract

摘要： In this work, the spin dynamics of a centrosymmetric WSe₂ bilayer has been investigated by the two-color time-resolved Kerr rotation together with helicity-resolved transient reflectance techniques. Two depolarization processes associated with the direct transition are discovered at a low temperature of 10 K, with the characteristic decaying time of ~3.8 ps and ~20 ps, respectively. The short decay time of ~3.8 ps is suggested to be the exciton spin lifetime of the WSe₂ bilayer, which is limited by the short exciton lifetime of the WSe₂ bilayer and the rapid intervalley electron-hole exchange interaction between K⁺ and K^- valley in the same layer as that of monolayer. The long decay time of ~20 ps is suggested to be the spin lifetime of photo-excited electrons, whose spin relaxation is governed by the rapid intervalley scattering from the K valley to the global minimum Σ valley and the subsequent interlayer charge transfer in WSe₂ bilayer. Our experimental results prove the existence of the spin-polarized excitons and carriers even in centrosymmetric transition metal dichalcogenides (TMDCs) bilayers, suggesting their potential valleytronic and spintronic device applications.

关键词: spin depolarization dynamics, WSe₂ bilayer, time-resolved Kerr rotation

Abstract: In this work, the spin dynamics of a centrosymmetric WSe₂ bilayer has been investigated by the two-color time-resolved Kerr rotation together with helicity-resolved transient reflectance techniques. Two depolarization processes associated with the direct transition are discovered at a low temperature of 10 K, with the characteristic decaying time of ~3.8 ps and ~20 ps, respectively. The short decay time of ~3.8 ps is suggested to be the exciton spin lifetime of the WSe₂ bilayer, which is limited by the short exciton lifetime of the WSe₂ bilayer and the rapid intervalley electron-hole exchange interaction between K⁺ and K^- valley in the same layer as that of monolayer. The long decay time of ~20 ps is suggested to be the spin lifetime of photo-excited electrons, whose spin relaxation is governed by the rapid intervalley scattering from the K valley to the global minimum Σ valley and the subsequent interlayer charge transfer in WSe₂ bilayer. Our experimental results prove the existence of the spin-polarized excitons and carriers even in centrosymmetric transition metal dichalcogenides (TMDCs) bilayers, suggesting their potential valleytronic and spintronic device applications.

Key words: spin depolarization dynamics, WSe₂ bilayer, time-resolved Kerr rotation

中图分类号: (Spin relaxation and scattering)

72.25.Rb

31.70.Hq (Time-dependent phenomena: excitation and relaxation processes, and reaction rates) 78.55.-m (Photoluminescence, properties and materials)

牛秉慧, 叶加良, 李婷, 李莹, 张新惠. Spin depolarization dynamics of WSe₂ bilayer[J]. 中国物理B, 2018, 27(5): 57202-057202.

Binghui Niu(牛秉慧), Jialiang Ye(叶加良), Ting Li(李婷), Ying Li(李莹), Xinhui Zhang(张新惠). Spin depolarization dynamics of WSe₂ bilayer[J]. Chin. Phys. B, 2018, 27(5): 57202-057202.

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Spin depolarization dynamics of WSe₂ bilayer

Spin depolarization dynamics of WSe₂ bilayer

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