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Condensed Matter Seminar
January 20 @ 11:00 am - 12:00 pm
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 8th 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.