Enhancement and modulation of valley polarization in Janus CrSSe with internal and external electric fields

The valley polarization, induced by the magnetic proximity effect, in monolayer transition metal dichalcogenides (TMDCs), has attracted significant attention due to the intriguing fundamental physics. However, the enhancement and modulation of valley polarization for real device applications is stil...

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Published in:Physical chemistry chemical physics : PCCP 2024-05, Vol.26 (17), p.1387-1393
Main Authors: Jiao, Runxian, Wei, Qingyuan, Zhang, Lichuan, Xie, Yuee, He, Jingjing, Zhou, Yangbo, Shen, Lei, Yuan, Jiaren
Format: Article
Language:English
Subjects:
Broken symmetry
Electric fields
First principles
Magnetic moments
Manganese dioxide
Modulation
Monolayers
Polarization
Spin-orbit interactions
Substrates
Transition metal compounds
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Summary:The valley polarization, induced by the magnetic proximity effect, in monolayer transition metal dichalcogenides (TMDCs), has attracted significant attention due to the intriguing fundamental physics. However, the enhancement and modulation of valley polarization for real device applications is still a challenge. Here, using first-principles calculations we investigate the valley polarization properties of monolayer TMDCs CrS 2 and CrSe 2 and how to enhance the valley polarization by constructing Janus CrSSe (with an internal electric field) and modulate the polarization in CrSSe by applying external electric fields. Janus CrSSe exhibits inversion symmetry breaking, internal electric field, spin-orbit coupling, and compelling spin-valley coupling. A magnetic substrate of the MnO 2 monolayer can induce a modest magnetic moment in CrSe 2 , CrSe 2 , and CrSSe. Notably, the Janus structure with an internal electric field has a much larger valley p compared with its non-Janus counterparts. Moreover, the strength of valley polarization can be further modulated by applying external electric fields. These findings suggest that Janus materials hold promise for designing and developing advanced valleytronic devices. The valley polarization is significantly amplified in the Janus monolayer CrSSe/MnO 2 and can be further modulated by applying external electric fields.
ISSN:1463-9076
1463-9084
DOI:10.1039/d3cp05298b