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

Nano Letters
Kyle L SeylerXiaodong Xu

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. Our results reveal a convenient new path toward the optical control of valley pseudospins and van der Waals magnetic heterostructures.

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Citations

Feb 2, 2019·Physical Chemistry Chemical Physics : PCCP·Xikui MaMingwen Zhao
Feb 2, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yu-Yun SunJun-Hao Chu
Feb 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·O Ávalos-OvandoS E Ulloa
Jun 28, 2019·Physical Chemistry Chemical Physics : PCCP·Guang YangXiujuan Mao
Aug 2, 2019·Nanotechnology·Kangwon KimHyeonsik Cheong
Jul 1, 2020·Nanotechnology·Brahim Marfoua, Jisang Hong
Apr 2, 2019·Physical Review Letters·Natalia CortésS E Ulloa
May 10, 2020·Physical Review Letters·Yuya OminatoMamoru Matsuo
Jan 29, 2020·Nature Nanotechnology·Ding ZhongXiaodong Xu
Aug 2, 2020·Nature Communications·Yingying WuKang L Wang
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Feb 27, 2021·The Journal of Physical Chemistry Letters·Shuhui ZhangWei Wei
Mar 17, 2021·The Journal of Physical Chemistry Letters·Daoxiong WuXiaojun Wu
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May 11, 2021·The Journal of Physical Chemistry Letters·Samuel H AmsterdamMark C Hersam
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Jul 26, 2019·The Journal of Physical Chemistry Letters·Xilong XuYing Dai
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