Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures
Abstract
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.
- Authors:
-
[1];
[5];
- 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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1482455
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Journal Volume: 18; Journal Issue: 6; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 2D magnets; Magnetic proximity effect; transition-metal dichalcogenide; valley; van der Waals heterostructure
Citation Formats
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., and Xu, Xiaodong. Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures. United States: N. p., 2018.
Web. doi:10.1021/acs.nanolett.8b01105.
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. Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures. United States. https://doi.org/10.1021/acs.nanolett.8b01105
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., and Xu, Xiaodong. Mon .
"Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures". United States. https://doi.org/10.1021/acs.nanolett.8b01105. https://www.osti.gov/servlets/purl/1482455.
@article{osti_1482455,
title = {Valley Manipulation by Optically Tuning the Magnetic Proximity Effect in WSe2/CrI3 Heterostructures},
author = {Seyler, Kyle L. and Zhong, Ding and Huang, Bevin and Linpeng, Xiayu and Wilson, Nathan P. and Taniguchi, Takashi and Watanabe, Kenji and Yao, Wang and Xiao, Di and McGuire, Michael A. and Fu, Kai-Mei C. and Xu, Xiaodong},
abstractNote = {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.},
doi = {10.1021/acs.nanolett.8b01105},
journal = {Nano Letters},
number = 6,
volume = 18,
place = {United States},
year = {Mon May 14 00:00:00 EDT 2018},
month = {Mon May 14 00:00:00 EDT 2018}
}
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Figure 1: Basic characterization and domains of WSe2/CrI3 heterostructure. (a) Schematic of WSe2/CrI3 heterostructure (left). Valley energy level diagram and optical selection rules of monolayer WSe2 with magnetic exchange field coupling (right). h-BN encapsulation layers are not shown. (b) Optical microscope image of heterostructure. Dashed box region shows the lasermore »
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