Disparate exciton-phonon couplings for zone center and boundary phonons in solid-state graphite

Abstract

The exciton-phonon coupling in highly oriented pyrolytic graphite is studied using resonant inelastic X-ray scattering (RIXS) spectroscopy. With ~ 70 meV energy resolution, multiple low energy excitations associated with coupling to phonons can be clearly resolved in RIXS spectra. Using resonance dependence and the closed form for RIXS cross-section without considering the intermediate state mixing of phonon modes, the dimensionless coupling constant g is determined to be 5 and 0.4, corresponding to the coupling strength of 0.42 eV +/- 40 meV and 0.21 eV +/- 30 meV, for zone center and boundary phonons respectively. The reduced g value for zone-boundary phonon may be related to its double resonance nature.

arXiv commentMain text is 20 pages with 4 figures Supplementary information is 10 pages with 3 figures

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• Probing electron-phonon interactions away from the Fermi level with resonant inelastic x-ray scattering
• Doping-dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates
• The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates