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Title: Probing magnetic-proximity-effect enlarged valley splitting in monolayer WSe2 by photoluminescence
Authors: Zou, Chenji
Cong, Chunxiao
Shang, Jingzhi
Zhao, Chuan
Eginligil, Mustafa
Wu, Lishu
Chen, Yu
Zhang, Hongbo
Feng, Shun
Zhang, Jing
Zeng, Hao
Huang, Wei
Yu, Ting
Keywords: Science::Physics
Issue Date: 2018
Source: Zou, C., Cong, C., Shang, J., Zhao, C., Eginligil, M., Wu, L., . . . Yu, T. (2018). Probing magnetic-proximity-effect enlarged valley splitting in monolayer WSe2 by photoluminescence. Nano Research, 11(12), 6252-6259. doi:10.1007/s12274-018-2148-z
Journal: Nano Research
Abstract: Possessing a valley degree of freedom and potential in information processing by manipulating valley features (such as valley splitting), group-VI monolayer transition metal dichalcogenides have attracted enormous interest. This valley splitting can be measured based on the difference between the peak energies of σ+ and σ− polarized emissions for excitons or trions in direct band gap monolayer transition metal dichalcogenides under perpendicular magnetic fields. In this work, a well-prepared heterostructure is formed by transferring exfoliated WSe2 onto a EuS substrate. Circular-polarization-resolved photoluminescence spectroscopy, one of the most facile and intuitive methods, is used to probe the difference of the gap energy in two valleys under an applied out-of-plane external magnetic field. Our results indicate that valley splitting can be enhanced when using a EuS substrate, as compared to a SiO2/Si substrate. The enhanced valley splitting of the WSe2/EuS heterostructure can be understood as a result of an interfacial magnetic exchange field originating from the magnetic proximity effect. The value of this magnetic exchange field, based on our estimation, is approximately 9 T. Our findings will stimulate further studies on the magnetic exchange field at the interface of similar heterostructures.
ISSN: 1998-0124
DOI: 10.1007/s12274-018-2148-z
Rights: © 2018 Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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