Fig. 5: Resonant Inelastic X-ray Scattering (RIXS) Reveals Electron-Phonon Coupling in the Valence Band.
From: Coupling of electronic transition to ferroelectric order in a 2D semiconductor
a RIXS spectra measured at the O-K edge, with σ (blue) and π (red) polarized light at T = 35K. The incident photon energies were selected according to the main peaks displayed by the O-K XAS, shown in (b). c Low-energy zoom-in of the RIXS spectra, measured for σ polarization (blue dots) at various incident photon energies. The spectra were fitted with five Voigt-shaped functions respectively centered at − 7 meV (v0), 0 meV (v1), 7 meV (v2), 14 meV (v3), and 36 meV (v4). The first four peaks are resolution-limited. The fit sum is represented by the blue solid line. Error bars indicate one standard deviation. Similar results are obtained for π polarization, see Supplementary Fig. 12. RIXS spectra showing full range of energy loss were also shown in Supplementary Fig. 12.
