论文标题
通过电子能量损失光谱探测分层材料的散装等离子体连续体，在反射几何形状中
Probing the bulk plasmon continuum of layered materials through electron energy loss spectroscopy in a reflection geometry
论文作者
论文摘要
已知2D导电平面的周期性排列可容纳A（散装）等离子体分散，该等离子体分散体在3D金属的典型，间隙行为与无间隙的声学状态之间插值，这是平面外波动的函数。众所周知，在反射几何形状中，与电子能量损耗光谱（EEL）相关的半无限系统（如高分辨率鳗鱼（HREELS）中）是众所周知的，可以容纳一个表面等离子体，该等离子体停止在截止波动的截止波动下传播。由于F-SUM规则是否需要有限的响应，无论是否存在急剧的激发，我们证明了表面损耗函数中保留的内容 - HREELS探测的材料响应 - 是来自Infinite系统的（大量）等离子体的贡献。特别是，我们在表面损耗函数中的等离子体连续体和光谱重量之间提供一对一的映射。鉴于这一结果，我们建议将HREEL视为分层材料中等离子体连续体的长波长探针。
A periodic arrangement of 2D conducting planes is known to host a (bulk) plasmon dispersion that interpolates between the typical, gapped behavior of 3D metals and a gapless, acoustic regime as a function of the out-of-plane wavevector. The semi-infinite system -- the configuration relevant to Electron Energy Loss Spectroscopy (EELS) in a reflection geometry, as in High Resolution EELS (HREELS) -- is known to host a surface plasmon that ceases to propagate below a cutoff wavevector. As the f-sum rule requires a finite response whether or not there exist sharp excitations, we demonstrate that what remains in the surface loss function -- the material response probed by HREELS -- is the contribution from the (bulk) plasmon of the infinite system. In particular, we provide a one-to-one mapping between the plasmon continuum and the spectral weight in the surface loss function. In light of this result, we suggest that HREELS be considered a long wavelength probe of the plasmon continuum in layered materials.
