Article Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics

Ding Zhong ; Kyle L. Seyler ; Xiayu Linpeng ; Ran Cheng ; Nikhil Sivadas ; Bevin Huang ; Emma Schmidgall ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Michael A. McGuire ; Wang Yao ; Di Xiao ; Kai-Mei C. Fu ; Xiaodong Xu

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Ding Zhong, Kyle L. Seyler, Xiayu Linpeng, Ran Cheng, Nikhil Sivadas, Bevin Huang, Emma Schmidgall, Takashi Taniguchi, Kenji Watanabe, Michael A. McGuire, Wang Yao, Di Xiao, Kai-Mei C. Fu, Xiaodong Xu. Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics. Science Advances. 2017, 3 (5), . https://doi.org/10.1126/sciadv.1603113
SAMURAI

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(abstract)

The integration of magnetic material with semiconductors has been fertile ground for fundamental science as well as of great practical interest toward the seamless integration of information processing and storage. We create van der Waals heterostructures formed by an ultrathin ferromagnetic semiconductor CrI3 and a monolayer of WSe2. We observe un- precedented control of the spin and valley pseudospin in WSe2, where we detect a large magnetic exchange field of nearly 13 T and rapid switching of the WSe2 valley splitting and polarization via flipping of the CrI3 magnetization. The WSe2 photoluminescence intensity strongly depends on the relative alignment between photoexcited spins in WSe2 and the CrI3 magnetization, because of ultrafast spin-dependent charge hopping across the heterostructure interface. The photoluminescence detection of valley pseudospin provides a simple and sensitive method to probe the intriguing domain dynamics in the ultrathin magnet, as well as the rich spin interactions within the heterostructure.

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Keyword: Magnetic material, van der Waals heterostructures, spin interactions

Date published: 2017-05-05

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

  • Science Advances (ISSN: 23752548) vol. 3 issue. 5

Funding:

  • Research Grants Council, University Grants Committee HKU17305914P
  • Basic Energy Sciences ID0EP1CI17419
  • Basic Energy Sciences DE-SC0008145
  • Basic Energy Sciences ID0EOBDI17420
  • Basic Energy Sciences DE-SC0012509
  • Research Grants Council, University Grants Committee ID0EPIDI17421

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1126/sciadv.1603113

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Updated at: 2025-02-28 16:30:50 +0900

Published on MDR: 2025-02-28 16:30:50 +0900

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