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

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.

preprint2020arXivOpen access
Xuefei FengShawn SallisYu-Cheng ShaoRuimin QiaoYi-Sheng LiuLi Cheng KaoAnton TremsinZahid HussainWanli YangJinghua GuoYi-De Chuang
cond-mat.str-elphysics.app-phcond-mat.mtrl-sci
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Xuefei FengShawn SallisYu-Cheng ShaoRuimin QiaoYi-Sheng LiuLi Cheng KaoAnton TremsinZahid HussainWanli YangJinghua GuoYi-De Chuang

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