Light helicity detector based on 2D magnetic semiconductor Crl3

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-Crl(3)-graphene vdW hetero-structures. We investigate the circularly polarized light excited current and reflective magnetic circular dichroism (RMCD) under various magnetic fields in both monolayer and multilayer Crl(3) devices. The devices exhibit clear helicity-selective photoresponse behavior determined by the magnetic state of Crl(3). We also find abnormal negative photocurrents at higher bias in both monolayer and multilayer Crl(3). A possible explanation is proposed for this phenomenon. Our work reveals the interplay between magnetic and optoelectronic properties in Crl(3) and paves the way to developing spin-optoelectronic devices.

Automated summary

This study develops light helicity detectors based on graphene-Crl(3)-graphene hetero-structures, revealing the interplay between magnetic and optoelectronic properties in Crl(3) and paving the way for the development of spin-optoelectronic devices in the future.