论文标题
在高度定向的黄石石墨（HOPG）中，血浆诱导的对称性破坏次级电子发射（HOPG）
Secondary Electron Emission by Plasmon Induced Symmetry Breaking in Highly Oriented Pyrolitic Graphite (HOPG)
论文作者
论文摘要
具有相关电子对的两粒子光谱法用于在次级电子光谱，$（π+σ） - $等离子体峰和高度定向的黄石石墨的无占用带结构之间建立因果关系。等离子谱相对于涉及的带间跃迁解决了问题，并清楚地表现出最终的状态效应，特别是由于沿$γ$ a方向的层间共振之间的能量差距。相应的最终状态效应也可以在次级电子光谱中鉴定。结果的解释是根据密度功能理论和紧密结合计算进行的。等离子体的激发系统的对称性，并导致沿$γa$ - 方向的原子样$σ^*$频段的层层共振的杂交。这些混合状态具有高密度的状态以及沿石墨$ c $轴的足够的移动性，从而在整个文献中报道的发射二级电子频谱中，在发射的二级电子频谱中产生了尖锐的$ \ sim $ 3 \ ev的共振。
Two-particle spectroscopy with correlated electron pairs is used to establish the causal link between the secondary electron spectrum, the $(π+σ)-$plasmon peak and the unoccupied band structure of highly oriented pyrolitic graphite. The plasmon spectrum is resolved with respect to the involved interband transitions and clearly exhibits final state effects, in particular due to the energy gap between the interlayer resonances along the $Γ$A-direction. The corresponding final state effects can also be identified in the secondary electron spectrum. Interpretation of the results is performed on the basis of density functional theory and tight binding calculations. Excitation of the plasmon perturbs the symmetry of the system and leads to hybridisation of the interlayer resonances with atom-like $σ^*$ bands along the $ΓA$-direction. These hybrid states have a high density of states as well as sufficient mobility along the graphite $c$-axis leading to the sharp $\sim$3\ eV resonance in the spectrum of emitted secondary electrons reported throughout the literature.
