Light helicity detector based on 2D magnetic semiconductor CrI3

Xing Cheng, Zhixuan Cheng, Cong Wang, Minglai Li, Pingfan Gu, Shiqi Yang, Yanping Li, Kenji Watanabe, Takashi Taniguchi, Wei Ji and Lun Dai ()
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Xing Cheng: Peking University
Zhixuan Cheng: Peking University
Cong Wang: Renmin University of China
Minglai Li: Peking University
Pingfan Gu: Peking University
Shiqi Yang: Peking University
Yanping Li: Peking University
Kenji Watanabe: National Institute for Materials Science, 1-1 Namiki
Takashi Taniguchi: National Institute for Materials Science, 1-1 Namiki
Wei Ji: Renmin University of China
Lun Dai: Peking University

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract Two-dimensional magnetic semiconductors provide a platform for studying physical phenomena at atomically thin limit, and promise magneto-optoelectronic devices application. Here, we report light helicity detectors based on graphene-CrI3-graphene vdW heterostructures. We investigate the circularly polarized light excited current and reflective magnetic circular dichroism (RMCD) under various magnetic fields in both monolayer and multilayer CrI3 devices. The devices exhibit clear helicity-selective photoresponse behavior determined by the magnetic state of CrI3. We also find abnormal negative photocurrents at higher bias in both monolayer and multilayer CrI3. A possible explanation is proposed for this phenomenon. Our work reveals the interplay between magnetic and optoelectronic properties in CrI3 and paves the way to developing spin-optoelectronic devices.

Date: 2021
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DOI: 10.1038/s41467-021-27218-3

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