Fig. 4: Evolution of polaronic effect across the magnetic phase transition from the layered AFM to FM in bilayer CrI3.
From: Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet CrI3
a Raman spectra of bilayer CrI3 acquired at 10 K in the circularly parallel polarization channels, RR and LL, where RR (LL) stands for that both incident and scattered polarizations are selected to be right-handed (left-handed) circularly polarized, with an applied out-of-plane magnetic field (\(B_ \bot\)) of 1 T (top), 0 T (middle), and −1 T (bottom), respectively. b, c Plots of the Poisson fit amplitude \(A_0\) (b) and electron–phonon coupling strength \(\alpha _{2{\mathrm{D}}}\) (c) as a function of the applied \(B_ \bot\) in RR (orange data points) and LL (blue) channels. Solid lines are step (orange and blue in b) and linear (gray in c) function fits to the magnetic field dependence of \(A_0\) and \(\alpha _{2{\mathrm{D}}}\), respectively. Error bars are defined as one standard error of the fitting parameters.
