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,E. R. Schmidgall,Takashi Taniguchi,Kenji Watanabe,Michael A. McGuire,Wang Yao,Di Xiao,Kai-Mei C. Fu,Xiaodong Xu +13 more
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TLDR
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.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 unprecedented 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.read more
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Gate-tunable room-temperature ferromagnetism in two-dimensional Fe 3 GeTe 2 .
Yujun Deng,Yujun Deng,Yijun Yu,Yijun Yu,Yichen Song,Yichen Song,Jingzhao Zhang,Naizhou Wang,Naizhou Wang,Zeyuan Sun,Zeyuan Sun,Yangfan Yi,Yangfan Yi,Yizheng Wu,Yizheng Wu,Shiwei Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Jing Wang,Xianhui Chen,Xianhui Chen,Yuanbo Zhang,Yuanbo Zhang +23 more
TL;DR: It is found that the itinerant ferromagnetism persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy, which opens up opportunities for potential voltage-controlled magnetoelectronics based on atomically thin van der Waals crystals.
Journal ArticleDOI
Colloquium : Excitons in atomically thin transition metal dichalcogenides
Gang Wang,Alexey Chernikov,Mikhail M. Glazov,Tony F. Heinz,Xavier Marie,Thierry Amand,Bernhard Urbaszek +6 more
TL;DR: In this article, the authors reviewed recent progress in understanding of the excitonic properties in monolayer transition metal dichalcogenides (TMDs) and future challenges are laid out.
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Two-dimensional magnetic crystals and emergent heterostructure devices
TL;DR: Recognizing that magnetic anisotropy can be used to induce stable magnetism in atomic monolayers, Gong and Zhang provide an overview of the materials available and the physical understanding of the effects and then discuss how these effects could be exploited for widespread practical applications.
Journal ArticleDOI
Magnetism in two-dimensional van der Waals materials.
TL;DR: These cleavable materials provide the ideal platform for exploring magnetism in the two-dimensional limit, where new physical phenomena are expected, and represent a substantial shift in the authors' ability to control and investigate nanoscale phases.
Journal Article
Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe 3 GeTe 2
Yujun Deng,Yijun Yu,Yichen Song,Jingzhao Zhang,Naizhou Wang,Zeyuan Sun,Yangfan Yi,Yizheng Wu,Shiwei Wu,Junyi Zhu,Jing Wang,Xianhui Chen,Yuanbo Zhang +12 more
TL;DR: In this paper, it was shown that the itinerant ferromagnetic order persists in Fe3GeTe2 down to the monolayer with an out-of-plane magnetocrystalline anisotropy.
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