Ultrafast investigation of room temperature valley polarization in"optical bilayer"WS2

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外文摘要：Monolayer transition metal dichalcogenides(TMDCs)have become a promising platform in valleytronics due to possessing the regulatable valley degrees of freedom.While,as a result of the rapid intervalley scattering,it is difficult to measure the PL valley polarization of monolayer TMDCs at room temperature,which limits their application in valleytronics devices.Here,we report a room temperature photoluminescence(PL)valley polarization up to 3.73％in an"optical bilayer"WS2 formed by transferring monolayer WS2 onto flat Ag film.Furthermore,in the transient absorption(TA)measurements,a remarkably long valley depolarization lifetime is found.Thus,we demonstrate the valley properties of such"optical bilayer"WS2 resemble actual bilayer WS2,in which the robust valley polarization can be attributed to the phonons depletion effect and the blocked interlayer hopping processes.These peculiar valley features in"optical bilayer"WS2 provide a particularly simple method to enhance valley control at room temperature.

外文关键词：

valleytronicsoptical bilayertransient absorptiontungsten disulfide

作者：

ZHAO LeYi、WANG Hai、LIU TianYu、LI FangFei、ZHOU Qiang、WANG HaiYu

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作者单位：

Synergetic Extreme Condition High-Pressure Science Center,State Key Laboratory of Superhard Materials,College of Physics,Jilin University Changchun 130012,China

State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJilin Provincial Science and Technology Development ProjectJilin Provincial Science and Technology Development Project

项目编号：

219030352207303721773087120741411227416820210509038RQ20230101059JC

出版年：

2024

DOI：

10.1007/s11431-022-2414-5

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.67(1)

参考文献量42