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

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arxiv 2001.01327 v1 pith:TUPCLNUR submitted 2020-01-05 cond-mat.mtrl-sci cond-mat.str-elphysics.app-ph

Xuefei Feng , Shawn Sallis , Yu-Cheng Shao , Ruimin Qiao , Yi-Sheng Liu , Li Cheng Kao , Anton Tremsin , Zahid Hussain
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Wanli Yang Jinghua Guo Yi-De Chuang
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classification cond-mat.mtrl-scicond-mat.str-elphysics.app-ph
keywords couplingphononsrixsboundarycenterenergyexciton-phonongraphite
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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.

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  1. Ultrafast dynamics of vibronically dressed core-excitons in graphite: a femtosecond RIXS perspective

    cond-mat.mtrl-sci 2025-04 conditional novelty 7.0 of 10

    Time-resolved RIXS at an X-ray free-electron laser shows that optical excitation of graphite reduces the apparent core-exciton-phonon coupling strength, with ultrafast dynamics that depend on the X-ray detuning.

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