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説明:

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.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Magnetic material, van der Waals heterostructures, spin interactions

刊行年月日: 2017-05-05

出版者: American Association for the Advancement of Science (AAAS)

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1126/sciadv.1603113

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更新時刻: 2025-02-28 16:30:50 +0900

MDRでの公開時刻: 2025-02-28 16:30:50 +0900