Liu Zhen, Guo Kai, Hu Guangwei, Shi Zhongtai, Li Yue, Zhang Linbo, Chen Haiyan, Zhang Li, Zhou Peiheng, Lu Haipeng, Lin Miao-Ling, Liu Sizhao, Cheng Yingchun, Liu Xue Lu, Xie Jianliang, Bi Lei, Tan Ping-Heng, Deng Longjiang, Qiu Cheng-Wei, Peng Bo
National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.
Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore.
Sci Adv. 2020 Oct 23;6(43). doi: 10.1126/sciadv.abc7628. Print 2020 Oct.
"Magneto-optical" effect refers to a rotation of polarization plane, which has been widely studied in traditional ferromagnetic metal and insulator films and scarcely in two-dimensional layered materials. Here, we uncover a new nonreciprocal magnetophonon Raman scattering effect in ferromagnetic few-layer CrI We observed a rotation of the polarization plane of inelastically scattered light between -20 and +60 that are tunable by an out-of-plane magnetic field from -2.5 to 2.5 T. It is experimentally observed that the degree of polarization can be magnetically manipulated between -20 and 85%. This work raises a new magneto-optical phenomenon and could create opportunities of applying two-dimensional ferromagnetic materials in Raman lasing, topological photonics, and magneto-optical modulator for information transport and storage.
“磁光”效应指的是偏振面的旋转，这在传统铁磁金属和绝缘体薄膜中已得到广泛研究，而在二维层状材料中研究较少。在此，我们在铁磁少层CrI₃中发现了一种新的非互易磁声子拉曼散射效应。我们观察到非弹性散射光的偏振面在-20°至+60°之间旋转，该角度可通过-2.5至2.5特斯拉的面外磁场进行调节。实验观察到偏振度可在-20%至85%之间进行磁控。这项工作提出了一种新的磁光现象，并可能为二维铁磁材料在拉曼激光、拓扑光子学以及用于信息传输和存储的磁光调制器中的应用创造机会。
