Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures

Seyler, Kyle L.; Zhong, Ding; Huang, Bevin; Linpeng, Xiayu; Wilson, Nathan P.; Taniguchi, Takashi; Watanabe, Kenji; Yao, Wang; Xiao, Di; McGuire, Michael A.; Fu, Kai-Mei C.; Xu, Xiaodong

doi:10.1021/acs.nanolett.8b01105

Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe₂/CrI₃ Heterostructures

Journal Article · Mon May 14 00:00:00 EDT 2018 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b01105· OSTI ID:1482455

^[1]; Zhong, Ding ^[1]; Huang, Bevin ^[1]; Linpeng, Xiayu ^[1]; Wilson, Nathan P. ^[1]; Taniguchi, Takashi ^[2]; Watanabe, Kenji ^[2]; Yao, Wang ^[3]; Xiao, Di ^[4]; ^[5]; Fu, Kai-Mei C. ^[1]; Xu, Xiaodong ^[1]

Univ. of Washington, Seattle, WA (United States)
National Institute for Materials Science, Tsukuba (Japan)
Univ. of Hong Kong, Hong Kong (China)
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Monolayer valley semiconductors, such as tungsten diselenide (WSe₂), possess valley pseudospin degrees of freedom that are optically addressable but degenerate in energy. Lifting the energy degeneracy by breaking time-reversal symmetry is vital for valley manipulation. This has been realized by directly applying magnetic fields or via pseudomagnetic fields generated by intense circularly polarized optical pulses. However, sweeping large magnetic fields is impractical for devices, and the pseudomagnetic fields are only effective in the presence of ultrafast laser pulses. The recent rise of two-dimensional (2D) magnets unlocks new approaches to controlling valley physics via van der Waals heterostructure engineering. Here, we demonstrate the wide continuous tuning of the valley polarization and valley Zeeman splitting with small changes in the laser-excitation power in heterostructures formed by monolayer WSe₂ and 2D magnetic chromium triiodide (CrI₃). The valley manipulation is realized via the optical control of the CrI₃ magnetization, which tunes the magnetic exchange field over a range of 20 T. Lastly, our results reveal a convenient new path toward the optical control of valley pseudospins and van der Waals magnetic heterostructures.

View Accepted Manuscript (DOE)

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:: 1482455

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 6 Vol. 18; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

2D magnets
36 MATERIALS SCIENCE
Magnetic proximity effect
transition-metal dichalcogenide
valley
van der Waals heterostructure