Ultrafast Exciton and Spin Dynamics of Monolayer MoSi<sub>2</sub>N<sub>4</sub> Studied by Non-Degenerate Pump-Probe Transient Transmission Spectroscopy

doi:10.1002/advs.202417209

IMR OpenIR

	Ultrafast Exciton and Spin Dynamics of Monolayer MoSi₂N₄ Studied by Non-Degenerate Pump-Probe Transient Transmission Spectroscopy
	Wu, Huiping 1; Sun, Su 2; Xu, Chuan 2; Chen, Ke 1,3; Ren, Wencai 2; Lai, Tianshu 1
通讯作者	Chen, Ke(chenk35@mail.sysu.edu.cn) ; Ren, Wencai(wcren@imr.ac.cn) ; Lai, Tianshu(stslts@mail.sysu.edu.cn)
	2025-03-07
发表期刊	ADVANCED SCIENCE
页码	9
摘要	2D materials have attracted numerous attention for their potential applications in nano-photoelectronic and valleytronic devices. Recently, a new 2D material, MoSi2N4 monolayer, is synthesized and reported, and predicted to have many unique properties. Here, its ultrafast photoelectron and spin dynamics using femtosecond-resolved transient differential transmission and Faraday rotation spectroscopies are investigated. Complex and diverse ultrafast dynamics of excitons are observed with increasing probe wavelength from 510 to 640 nm, including fully positive and negative monotonic decaying dynamics as well as an initial positive (negative) peak followed by slow negative (positive) recovery dynamics, and are explained well based on the band structure of MoSi2N4 monolayer containing a deep defect level locating above the midpoint of direct bandgap at K valley. Spin polarization of A and B excitons is found controlled by the circular helicity of exciting light. The spin relaxation lifetime of B excitons is determined as approximate to 0.73 ps.
关键词	exciton dynamics monolayer MoSi2N4 spin dynamics time-resolved Faraday rotation spectroscopy transient differential transmission spectroscopy
资助者	National Key R&D Program of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program ; Special Projects of the Central Government in Guidance of Local Science and Technology Development ; Guangdong Innovative and Entrepreneurial Research Team Program ; Fundamental Research Funds for the Central Universities ; Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices
DOI	10.1002/advs.202417209
收录类别	SCI
语种	英语
资助项目	National Key R&D Program of China ; National Natural Science Foundation of China[12074441] ; National Natural Science Foundation of China[52188101] ; National Natural Science Foundation of China[52122202] ; National Natural Science Foundation of China[52176173] ; LiaoNing Revitalization Talents Program[XLYC2201003] ; Special Projects of the Central Government in Guidance of Local Science and Technology Development[2024010859-JH6/1006] ; Guangdong Innovative and Entrepreneurial Research Team Program[2021ZT09L227] ; Fundamental Research Funds for the Central Universities[22hytd08] ; Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices[2022B1212010008] ; [2021YFA1400804]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:001439123000001
出版者	WILEY
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179841
专题	中国科学院金属研究所
通讯作者	Chen, Ke; Ren, Wencai; Lai, Tianshu
作者单位	1.Sun Yat Sen Univ, Sch Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 3.Sun Yat Sen Univ, Ctr Neutron Sci & Technol, Sch Phys, Guangdong Prov Key Lab Magnetoelectr Phys & Device, Guangzhou 510275, Peoples R China
推荐引用方式 GB/T 7714	Wu, Huiping,Sun, Su,Xu, Chuan,et al. Ultrafast Exciton and Spin Dynamics of Monolayer MoSi₂N₄ Studied by Non-Degenerate Pump-Probe Transient Transmission Spectroscopy[J]. ADVANCED SCIENCE,2025:9.
APA	Wu, Huiping,Sun, Su,Xu, Chuan,Chen, Ke,Ren, Wencai,&Lai, Tianshu.(2025).Ultrafast Exciton and Spin Dynamics of Monolayer MoSi₂N₄ Studied by Non-Degenerate Pump-Probe Transient Transmission Spectroscopy.ADVANCED SCIENCE,9.
MLA	Wu, Huiping,et al."Ultrafast Exciton and Spin Dynamics of Monolayer MoSi₂N₄ Studied by Non-Degenerate Pump-Probe Transient Transmission Spectroscopy".ADVANCED SCIENCE (2025):9.