Raman Spectroscopy Studies of Magneto-optical Effects in CrI₃

Two-dimensional (2D) van der Waals (vdW) magnetic materials have attracted great interest because of their potential applications in optoelectronic and spintronic devices. CrI₃, as a prototypical 2D vdW magnet, has been shown to be a layered antiferromagnet in its few-layer form. The layered antiferromagnet state can be switched to a fully spin-polarized state upon the application of an out-of-plane magnetic field, offering a new platform to explore the magneto-optical effects originating from the coupling between lattice, charge, orbital, and spin degrees of freedom. In this talk, I will present Raman spectroscopy studies of magneto-optical effects due to spin-phonon coupling and electron-phonon coupling in atomically thin CrI₃. First, I will show a Davydov-split-induced N-fold multiplet in N-layer CrI₃ and discuss the layered-magnetism-coupled phonon scattering mechanism. Then, I will show the strong polaronic character of excitons in CrI₃ evidenced by the presence of periodic broad modes up to 8^th order in the resonant Raman scattering. Our work highlights the new opportunities for tailoring light-matter interactions in 2D magnets.

Speaker: Wencan Jin- Assistant Professor in the Department of Physics at Auburn University.