论文标题
固态石墨中的区域中心和边界声子的不同激子 - 波音耦合
Disparate exciton-phonon couplings for zone center and boundary phonons in solid-state graphite
论文作者
论文摘要
使用谐振非弹性X射线散射（RIX）光谱学研究了高度定向的热解石墨中的激子 - 音波耦合。有〜70 MEV能量分辨率，可以在RIXS光谱中清楚地解决与与声子耦合相关的多种低能激励。使用共振依赖性和RIX横截面的闭合形式，而无需考虑声子模式的中间状态混合，无量纲耦合常数G被确定为5和0.4，对应于0.42 EV +/- 40 MEV和0.21 EV +/- 30 MEV的耦合强度，分别为区域中心和边界语音。区域边界声子的G值降低可能与其双共振性质有关。
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.
