典型文献
Valley dynamics of different excitonic states in monolayer WSe2 grown by molecular beam epitaxy
文献摘要：
Monolayer transition-metal dichalcogenides possess rich excitonic physics and unique valley-contrasting optical selec-tion rule,and offer a great platform for long spin/valley lifetime engineering and the associated spin/valleytronics exploration.Using two-color time-resolved Kerr rotation and time-resolved reflectivity spectroscopy,we investigate the spin/valley dynam-ics of different excitonic states in monolayer WSe2 grown by molecular beam epitaxy.With fine tuning of the photon energy of both pump and probe beams,the valley relaxation process for the neutral excitons and trions is found to be remarkably differ-ent—their characteristic spin/valley lifetimes vary from picoseconds to nanoseconds,respectively.The observed long trion spin lifetime of＞2.0 ns is discussed to be associated with the dark trion states,which is evidenced by the photon-energy depend-ent valley polarization relaxation.Our results also reveal that valley depolarization for these different excitonic states is intim-ately connected with the strong Coulomb interaction when the optical excitation energy is above the exciton resonance.
文献关键词：
中图分类号：
作者姓名：
Shengmin Hu;Jialiang Ye;Ruiqi Liu;Xinhui Zhang
作者机构：
State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Opto-electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China
文献出处：
引用格式：
[1]Shengmin Hu;Jialiang Ye;Ruiqi Liu;Xinhui Zhang-.Valley dynamics of different excitonic states in monolayer WSe2 grown by molecular beam epitaxy)[J].半导体学报（英文版）,2022(08):35-42
A类：
trions,trion,intim
B类：
Valley,dynamics,different,excitonic,states,monolayer,WSe2,grown,by,molecular,epitaxy,Monolayer,transition,metal,dichalcogenides,possess,rich,physics,unique,contrasting,optical,selec,rule,offer,great,platform,long,spin,engineering,associated,valleytronics,exploration,Using,two,color,resolved,Kerr,rotation,reflectivity,spectroscopy,we,investigate,With,fine,tuning,photon,energy,both,pump,probe,beams,relaxation,process,neutral,excitons,found,remarkably,their,characteristic,lifetimes,vary,from,picoseconds,nanoseconds,respectively,observed,discussed,dark,which,evidenced,depend,Our,results,also,reveal,that,depolarization,these,ately,connected,strong,Coulomb,interaction,when,excitation,above,resonance
AB值：
0.529061
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