Strongly Correlated Exciton‐Magnetization System for Optical Spin Pumping in CrBr3 and CrI3.

• DOI: 10.1002/adma.202209513
• Publication Date: 2023-02-14T22:09:56Z
• Authors: M. Grzeszczyk; S. Acharya; D. Pashov; Z. Chen; K. Vaklinova; M. van Schilfgaarde; K. Watanabe; T. Taniguchi; K. S. Novoselov; M. I. Katsnelson; M. Koperski
• Keywords: Hysteresis; Spin pumping

Ferromagnetism in van der Waals systems, preserved down to a monolayer limit, attracted attention class of materials with general composition CrX3 (X=I, Br, and Cl), which are treated now as canonical 2D ferromagnets. Their diverse magnetic properties, such different easy axes or varying controllable character in-plane interlayer ferromagnetic coupling, make them promising candidates for spintronic, photonic, optoelectronic, other applications. Still, significantly magneto-optical properties between the three have been presenting challenging puzzle researchers over last few years. Herewith, it is demonstrated that despite similar structural configurations, coupling excitons magnetization qualitatively CrBr3 CrI3 films. Through combination optical spin pumping experiments state-of-the-art theory describing bound excitonic states presence magnetization, we concluded hole-magnetization has opposite sign also ground excited exciton state. Consequently, efficient capabilities driven by via spin-dependent absorption, origins hysteresis unraveled.