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Nano Research 2018, 11(12): 6227-6236 https://doi.org/10.1007/s12274-018-2142-5
Research Article | Issue | Published: 21 July 2018

Intrinsic excitonic emission and valley Zeeman splitting in epitaxial MS2 (M = Mo and W) monolayers on hexagonal boron nitride

Show Author's Information Chunxiao Cong1,§( ),  Chenji Zou2,§,  Bingchen Cao2,§,  Lishu Wu2,  Jingzhi Shang2( ),  Haomin Wang3,  Zhijun Qiu1( ),  Laigui Hu1,  Pengfei Tian1,  Ran Liu1,  Ting Yu2( )
State Key Laboratory of ASIC and SystemSchool of Information Science and TechnologyFudan UniversityShanghai200433China
Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological UniversitySingapore637371Singapore
State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences865 Changning RoadShanghai200050China

§ Chunxiao Cong, Chenji Zou, and Bingchen Cao contributed equally to this work.

Keywords:
chemical vapor deposition, transition metal dichalcogenides, intrinsic excitonic emission, valley Zeeman splitting, hexagonal boron nitride
Cite this article:
Cong C, Zou C, Cao B, et al. Intrinsic excitonic emission and valley Zeeman splitting in epitaxial MS2 (M = Mo and W) monolayers on hexagonal boron nitride. Nano Research, 2018, 11(12): 6227-6236. https://doi.org/10.1007/s12274-018-2142-5
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Abstract Electronic supplementary material About this article

Two-dimensional (2D) semiconductors, represented by 2D transition metal dichalcogenides (TMDs), exhibit rich valley physics due to strong spin-orbit/spin-valley coupling. The most common way to probe such 2D systems is to utilize optical methods, which can monitor light emissions from various excitonic states and further help in understanding the physics behind such phenomena. Therefore, 2D TMDs with good optical quality are in great demand. Here, we report a method to directly grow epitaxial WS2 and MoS2 monolayers on hexagonal boron nitride (hBN) flakes with a high yield and high optical quality; these monolayers show better intrinsic light emission features than exfoliated monolayers from natural crystals. For the first time, the valley Zeeman splitting of WS2 and MoS2 monolayers on hBN has been visualized and systematically investigated. This study paves a new way to produce high optical quality WS2 and MoS2 monolayers and to exploit their intrinsic properties in a multitude of applications.

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Acknowledgements

Publication history

Received: 20 May 2018
Revised: 23 June 2018
Accepted: 02 July 2018
Published: 21 July 2018
Issue date: June 2021

Copyright

© Tsinghua University Press and Springer‐Verlag GmbH Germany, part of Springer Nature 2018

Acknowledgements

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 61774040, 11774170, and 61774042), the Opening project of State Key Laboratory of Functional Materials for Informatics (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences), the National Young 1000 Talent Plan of China, the Shanghai Municipal Natural Science Foundation (Nos. 16ZR1402500, 17ZR1446500, and 17ZR1446600), NTU Start-up grant M4080513, Singapore Ministry of Education (MOE) Tier 1 RG199/17, and Shanghai Pujiang Program (No. 16PJ1401000). C. C. thanks Dr. Ute Schmidt from WITec Company for AFM measurement.

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