Raman spectroscopy studies of spin-lattice coupling in bilayer CrI3

CrI₃ has been shown to be a layered antiferromagnet in its few-layer form. Upon the application of a moderate out-of-plane magnetic field, the layered antiferromagnetic state can be switched to a fully spin-polarized state. Among the few-layer CrI₃ system, bilayer CrI₃ is of particular interest because the coupling between its crystal structure and magnetic ordering can give rise to unique magneto-optical effects such as magnetic circular dichroism, nonreciprocal second harmonic generation, and deviation of Raman selection rules. In this talk, we will present Raman spectroscopic evidence of spin-lattice coupling in bilayer CrI₃. We will show that spin-lattice coupling in bilayer CrI₃ manifests itself in both first-order and higher-order Raman modes. The results of temperature and magnetic field dependence measurements will be discussed.