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Magnetic Proximity Effect in a van der Waals Moiré Superlattice

Qingjun Tong, Mingxing Chen, and Wang Yao
Phys. Rev. Applied 12, 024031 – Published 16 August 2019

Abstract

We investigate the magnetic proximity effect in a van der Waals heterostructure formed by a monolayer semiconductor stacked on a two-dimensional (2D) ferromagnet, where the lattice mismatch and twisting between the layers typically lead to the formation of a moiré pattern. We find that the magnetic proximity effect arising from the spin-dependent interlayer coupling depends sensitively on the interlayer atomic registry. Consequently, in the moiré pattern, the spatial variation of the atomic registry leads to a lateral modulation of a magnetic proximity field. Such a moiré modulated magnetic proximity effect manifests as a miniband spin splitting that strongly depends on the moiré periodicity, which can be mechanically tuned by a relative twisting and/or strain between the layers. We also show, because of the moiré modulation on the interlayer distance, a perpendicular electric field can be used to control the miniband spin splitting. Our results suggest potential nanodevices where the moiré modulated magnetic proximity effect can lead to unique spin controllability.

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  • Received 21 March 2019

DOI:https://doi.org/10.1103/PhysRevApplied.12.024031

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Qingjun Tong1,2,*, Mingxing Chen3, and Wang Yao2

  • 1School of Physics and Electronics, Hunan University, Changsha 410082, China
  • 2Department of Physics and Center of Theoretical and Computational Physics, University of Hong Kong, Hong Kong, China
  • 3Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Hunan Normal University, Changsha 410081, China

  • *tongqj@hnu.edu.cn

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Vol. 12, Iss. 2 — August 2019

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