论文标题
金属RIXS光谱中多电荷激发的签名
Signatures of multiple charge excitations in RIXS spectra of metals
论文作者
论文摘要
我们研究金属的谐振非弹性X射线散射（RIX）光谱中如何出现多电荷激发。该问题中的单个激发是等离子和电子孔对，通常忽略了多启示过程。但是，在小动量转移的情况下，多激发贡献可能会主导信号，并且需要了解如何解释数据。特别是，我们演示了如何“解码”总多启动强度并提取等离激子分散剂。尽管我们的计算基于随机相位近似，而随机相位不允许在整个参数区域中获得定量精确的结果，但我们希望它们能够捕获半疑问的所有预期的所有特征，用于带电的费米 - 液体状态，包括RIXS光谱的通用和奇异性质。
We study how multiple charge excitations appear in the resonant inelastic x-ray scattering (RIXS) spectra of metals. The single excitations in the problem are the plasmons and electron-hole pairs, and multi-excitation processes are usually neglected. However, at small momentum transfer the multi-excitation contributions may dominate the signal and one needs to understand how to interpret the data. In particular, we demonstrate how to "decode" the total multi-excitation intensity and extract the plasmon dispersion. While our calculations are based on the random phase approximation, which does not allow to obtain quantitatively precise results in the entire region of parameters, we expect them to capture semi-qualitatively all features expected for charged Fermi-liquid states, including universal and singular properties of the RIXS spectra.
