Fig. 1: Atomic force microscope (AFM) images and Raman spectra of the exfoliated α-RuCl3 flakes.
From: Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
a Representative AFM images of the exfoliated nanoflakes. b Height profiles of the nanoflakes along the red lines shown in a. c Thickness dependence of the Raman spectra measured at T = 300 K in RL polarization. Four major phonons are assigned to Eg symmetry. The asterisk denotes a symmetry-forbidden mode. The spectra are vertically shifted for clarity. d Representative fit of the low-energy Raman spectrum to a sum of two Gaussian and two Fano resonances. The green shading denotes a background magnetic continuum, which is thermally damped. e Thickness dependence of the integrated intensities of the Eg(2) Fano phonon (cyan balls), the quasielastic response (open triangles), and the thermally damped magnetic continuum (green squares). f, g Thickness dependence of the Fano asymmetry and linewidth for the Eg(2) Fano mode. The solid colored lines represent guides to the eye.
