Beating the exclusion rule against the coexistence of robust luminescence and ferromagnetism in chalcogenide monolayers

Hengli Duan, Peng Guo, Chao Wang, Hao Tan, Wei Hu, Wensheng Yan (), Chao Ma, Liang Cai, Li Song, Wenhua Zhang, Zhihu Sun (), Linjun Wang, Wenbo Zhao, Yuewei Yin, Xiaoguang Li and Shiqiang Wei ()
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Hengli Duan: University of Science and Technology of China
Peng Guo: University of Science and Technology of China
Chao Wang: Chinese Academy of Sciences
Hao Tan: University of Science and Technology of China
Wei Hu: University of Science and Technology of China
Wensheng Yan: University of Science and Technology of China
Chao Ma: Hunan University
Liang Cai: University of Science and Technology of China
Li Song: University of Science and Technology of China
Wenhua Zhang: University of Science and Technology of China
Zhihu Sun: University of Science and Technology of China
Linjun Wang: University of Science and Technology of China
Wenbo Zhao: University of Science and Technology of China
Yuewei Yin: University of Science and Technology of China
Xiaoguang Li: University of Science and Technology of China
Shiqiang Wei: University of Science and Technology of China

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Monolayer chalcogenide semiconductors with both luminescent and ferromagnetic properties are dreamed for simultaneous polarization and detection of the valley degree of freedom in valleytronics. However, a conventional chalcogenide monolayer lacks these coexisting properties due to their mutually exclusive origins. Herein we demonstrate that robust ferromagnetism and photoluminescence (PL) could be achieved in a (Co, Cr)-incorporated single monolayer MoS2, where the ferromagnetic interaction is activated by Co ions, and the nonradiative recombination channels of excitons is cut off by Cr ions. This strategy brings a 90-fold enhancement of saturation magnetization and 35-fold enhancement of PL intensity than the pristine MoS2 monolayer. The main reasons for the coexisting ferromagnetism and PL are the electronic interactions between the impurity bands of atop Cr adatoms and substitutional Co atoms, as well as the increased content of neutral exciton. Our findings could extend the applications of two-dimensional chalcogenides into spintronics, valleytronic and photoelectric devices.

Date: 2019
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DOI: 10.1038/s41467-019-09531-0

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