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Nano Research 2023, 16(7): 10580-10586 https://doi.org/10.1007/s12274-023-5865-x
Research Article | Issue | Published: 30 June 2023

Enhanced valley polarization in WSe2/YIG heterostructures via interfacial magnetic exchange effect

Show Author's Information Haihong Zheng1,2,  Biao Wu1,2,  Chang-Tian Wang3,4,  Shaofei Li1,  Jun He1,  Zongwen Liu5,6,  Jian-Tao Wang3,4,7,  Guoqiang Yu3,7,  Ji-An Duan2,  Yanping Liu1,2,8( )
School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, China
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, Central South University, Changsha 410083, China
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
The University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia
Songshan Lake Materials Laboratory, Dongguan 523808, China
Shenzhen Research Institute of Central South University, Shenzhen 518057, China
Keywords:
two-dimensional, valley polarization, valleytronics, magnetic exchange effect, magnetic substrate
Topics:
Semiconductor devices
Cite this article:
Zheng H, Wu B, Wang C-T, et al. Enhanced valley polarization in WSe2/YIG heterostructures via interfacial magnetic exchange effect. Nano Research, 2023, 16(7): 10580-10586. https://doi.org/10.1007/s12274-023-5865-x
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Abstract About this article

Exploiting the valley degrees of freedom as information carriers provides new opportunities for the development of valleytronics. Monolayer transition metal dichalcogenides (TMDs) with broken space-inversion symmetry exhibit emerging valley pseudospins, making them ideal platforms for studying valley electronics. However, intervalley scattering of different energy valleys limits the achievable degree of valley polarization. Here, we constructed WSe2/yttrium iron garnet (YIG) heterostructures and demonstrated that the interfacial magnetic exchange effect on the YIG magnetic substrate can enhance valley polarization by up to 63%, significantly higher than that of a monolayer WSe2 on SiO2/Si (11%). Additionally, multiple sharp exciton peaks appear in the WSe2/YIG heterostructures due to the strong magnetic proximity effect at the magnetic–substrate interface that enhances exciton emission efficiency. Moreover, under the effect of external magnetic field, the magnetic direction of the magnetic substrate enhances valley polarization, further demonstrating that the magnetic proximity effect regulates valley polarization. Our results provide a new way to regulate valley polarization and demonstrate the promising application of magnetic heterojunctions in magneto-optoelectronics.

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Acknowledgements

Publication history

Received: 04 May 2023
Revised: 21 May 2023
Accepted: 23 May 2023
Published: 30 June 2023
Issue date: July 2023

Copyright

© Tsinghua University Press 2023

Acknowledgements

The study presented in this paper was made possible with the generous support of multiple funding agencies. The authors would like to acknowledge the National Natural Science Foundation of China (Nos. 61775241, 62090035, and U19A2090), the Hunan Province Key Research and Development Project (No. 2019GK2233), the Hunan Provincial Science Fund for Distinguished Young Scholars (No. 2020JJ2059), the Youth Innovation Team of CSU (No. 2019012), the Key Program of Science and Technology Department of Hunan Province (Nos. 2019XK2001 and 2020XK2001), the Science and Technology Innovation Basic Research Project of Shenzhen (No. JCYJ20190806144418859), and the Postdoctoral Science Foundation of China (No. 2022M713546). The authors would also like to express their gratitude to the High-Performance Complex Manufacturing Key State Lab Project, Central South University (No. ZZYJKT2020-12) and the Australian Research Council (ARC) Discovery Project (No. DP180102976) for their support of Z. W. L. C. T. W. acknowledges support from the National Natural Science Foundation of China (No. 11974387) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB33000000). H. H. Z. is grateful for the support from the Postdoctoral Science Foundation of China (No. 2022M713546).

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