Observation of nonreciprocal magnetophonon effect in nonencapsulated few-layered CrI3

Zhen Liu; Kai Guo; Guangwei Hu; Zhongtai Shi; Yue Li; Linbo Zhang; Haiyan Chen; Li Zhang; Peiheng Zhou; Haipeng Lu; Miao-Ling Lin; Sizhao Liu; Yingchun Cheng; Xue Lu Liu; Jianliang Xie; Lei Bi; Ping-Heng Tan; Longjiang Deng; Cheng-Wei Qiu; Bo Peng

doi:10.1126/sciadv.abc7628

Observation of nonreciprocal magnetophonon effect in nonencapsulated few-layered CrI₃

Sci Adv. 2020 Oct 23;6(43):eabc7628. doi: 10.1126/sciadv.abc7628. Print 2020 Oct.

Authors

Zhen Liu¹, Kai Guo¹, Guangwei Hu², Zhongtai Shi¹, Yue Li¹, Linbo Zhang¹, Haiyan Chen¹, Li Zhang¹, Peiheng Zhou¹, Haipeng Lu¹, Miao-Ling Lin³, Sizhao Liu⁴, Yingchun Cheng⁴, Xue Lu Liu³, Jianliang Xie¹, Lei Bi¹, Ping-Heng Tan³, Longjiang Deng⁵, Cheng-Wei Qiu⁶, Bo Peng⁵

Affiliations

¹ 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.
² Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore.
³ State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083, China.
⁴ Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China.
⁵ 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. bo_peng@uestc.edu.cn chengwei.qiu@nus.edu.sg denglj@uestc.edu.cn.
⁶ Department of Electrical and Computer Engineering, National University of Singapore, 117583, Singapore. bo_peng@uestc.edu.cn chengwei.qiu@nus.edu.sg denglj@uestc.edu.cn.

Abstract

"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 CrI₃ 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.

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