Spin depolarization dynamics of WSe2 bilayer

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

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.

Keywords: spin depolarization dynamics WSe₂ bilayer time-resolved Kerr rotation

Received: 15 January 2018
Revised: 14 February 2018
Accepted manuscript online:

PACS:	72.25.Rb	(Spin relaxation and scattering)
	31.70.Hq	(Time-dependent phenomena: excitation and relaxation processes, and reaction rates)
	78.55.-m	(Photoluminescence, properties and materials)

Fund: 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).

Corresponding Authors: Xinhui Zhang
E-mail: xinhuiz@semi.ac.cn

Cite this article:

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 2018 Chin. Phys. B 27 057202

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Spin depolarization dynamics of WSe2 bilayer

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Spin depolarization dynamics of WSe₂ bilayer