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Spin depolarization dynamics of WSe_(2) bilayer
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作者 binghui niu Jialiang Ye +2 位作者 Ting Li Ying Li Xinhui Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期447-452,共6页
In this work,the spin dynamics of a centrosymmetric WSe2 bilayer has been investigated by the two-color timeresolved Kerr rotation together with helicity-resolved transient reflectance techniques.Two depolarization pr... In this work,the spin dynamics of a centrosymmetric WSe2 bilayer has been investigated by the two-color timeresolved 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 WSe_(2) 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 minimumΣvalley and the subsequent interlayer charge transfer in WSe_(2) 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. 展开更多
关键词 spin depolarization dynamics WSe_(2)bilayer time-resolved Kerr rotation
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