Light-induced magnetic phase transition in van der Waals antiferromagnets

被引:5
作者
Chen, Jiabin [1 ,2 ,3 ]
Li, Yang [3 ]
Yu, Hongyu [1 ,2 ]
Yang, Yali [1 ,2 ]
Jin, Heng [3 ]
Huang, Bing [3 ,4 ]
Xiang, Hongjun [1 ,2 ,5 ]
机构
[1] Fudan Univ, Inst Computat Phys Sci, Dept Phys, Key Lab Computat Phys Sci,Minist Educ, Shanghai 200433, Peoples R China
[2] Shanghai Qi Zhi Inst, Shanghai 200030, Peoples R China
[3] Beijing Computat Sci Res Ctr, Beijing 100193, Peoples R China
[4] Beijing Normal Univ, Dept Phys, Beijing 100193, Peoples R China
[5] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
基金
中国国家自然科学基金;
关键词
first-principles calculation; density functional theory; two-dimensional materials; magnetic phase transition; 71; 15; Mb; 73; 20; -r; 75; 30; Kz; FERROMAGNETISM; APPROXIMATION; SPECTRA;
D O I
10.1007/s11433-022-2085-x
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Control over magnetic properties by optical stimulation is not only interesting from the physics point of view, but also important for practical applications such as magneto-optical devices. Here, based on a simple tight-binding (TB) model, we propose a general theory of light-induced magnetic phase transition (MPT) in antiferromagnets. Considering the fact that the bandgap of the antiferromagnetic (AFM) phase is usually larger than that of the ferromagnetic (FM) one for a given system, we suggest that light-induced electronic excitation prefers to stabilize the FM state over the AFM one, and will induce an MPT from AFM phase to FM phase once a critical photocarrier concentration (alpha(c)) is reached. This theory has been confirmed by performing first-principles calculations on a series of 2D van der Waals (vdW) antiferromagnets. Interestingly, a linear relationship between alpha(c) and the intrinsic material parameters is obtained, in agreement with our TB model analysis. Our general theory paves a new way to manipulate 2D magnetism with high speed and superior resolution.
引用
收藏
页数:6
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