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

Journal Article · · Science Advances
 [1];  [1];  [1];  [2];  [2];  [1];  [1];  [3];  [3];  [4];  [5];  [5];  [1];  [1]
  1. Univ. of Washington, Seattle, WA (United States)
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  3. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Univ. of Hong Kong (China)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1376521
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 5 Vol. 3; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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