Observation of nonreciprocal magnetophonon effect in nonencapsulated few-layered CrI3

• Published in: Science advances 2020-10, Vol.6 (43)
• Main Authors: 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
• Format: Article
• Language: English
• Subjects: Optics; Physical Sciences; SciAdv r-articles
• ISSN: 2375-2548
• DOI: 10.1126/sciadv.abc7628

A new nonreciprocal magnetophonon Raman scattering effect is found in two-dimensional ferromagnetic few-layer CrI 3 . “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 3 . We observed a rotation of the polarization plane of inelastically scattered light between −20 o and +60 o 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.