Fig. 3: Multiple spin-orbit excitons and their thickness dependence.
From: Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
a Thickness dependence of spin-orbit exciton excitations measured at T = 300 K in RL polarization. The spectra are vertically shifted for clarity. The asterisks are single-, two, and three-phonon excitations arising from the Si substrate. b Room-temperature Raman spectrum of bulk α-RuCl3 measured up to Raman shift of 1 eV. c Representative fit of the spin-orbit excitons to four Gaussian profiles A1, A’1, A2, and A’2. False-color map of the Raman intensity in the frequency-thickness plane. d Frequency of the peaks A1 and A2 as a function of thickness. e Thickness dependence of the peak intensities normalized to the value of t = 50 nm as well as of the intensity ratio of the peak A1 to A2. The dashed lines are guides to the eye.
