Geometric effect of high-resolution electron energy loss spectroscopy on the identification of plasmons: An example of graphene
Geometric effect of high-resolution electron energy loss spectroscopy on the identification of plasmons: An example of graphene
复制标题
高分辨率电子能量损失光谱对等离子体激元识别的几何效应：石墨烯的一个例子
DOI：
10.1016/j.susc.2022.122067
复制
发表时间：
2022-03-11
期刊：
影响因子：
1.9
通讯作者：
Zhu, Xuetao
中科院分区：
文献类型：
--
作者：
Li, Jiade;Lin, Zijian;Zhu, Xuetao
High-resolution electron energy loss spectroscopy (HREELS) is one of the most powerful methods to detect the dispersion of plasmons. However, we find that in the HREELS measurement, the scattering geometric configu-ration will seriously affect the identification of plasmons. Here, taking graphene as an example, using the HREELS capable of two-dimensional energy-momentum mapping combined with the intensity distribution cal-culations, we visually display the intensity distribution of the scattering geometric factor. We demonstrate that the energy loss peaks from the scattering geometric effect may be misinterpreted as the features of an acoustic plasmon. In any HREELS measurement, it is necessary to evaluate the effect of the scattering geometry quan-titatively to identify the intrinsic surface excitations.
