Electron energy loss in simple metals and semiconductors
Electron energy loss in simple metals and semiconductors
复制标题
简单金属和半导体中的电子能量损失
DOI：
10.1080/00018738200101348
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发表时间：
1982
影响因子：
--
通讯作者：
K. Sturm
中科院分区：
文献类型：
--
作者：
K. Sturm
摘要本文从随机相位近似下的微观介电矩阵出发，计算了与频率和波矢量相关的宏观介电函数eM(q, ω)，它决定了能量损失函数和在极限q→0下的光学性质。在近自由电子赝势理论中，二阶微扰理论包含了晶体势的影响。应用该理论研究了周期势对简单金属和半导体等离激元线形的影响，并与实验作了比较。为了解释理论和实验之间的差异，我们主要根据文献中的理论来研究其他各种效应。这些效应来自于RPA以外的多体效应、声子的存在以及可极化的核心电子。
Abstract In this review article, the frequency and wave-vector dependent macroscopic dielectric function eM(q, ω), which determines the energy loss function and in the limit q →0 the optical properties, is calculated from the microscopic dielectric matrix in the random phase approximation. The effect of the crystal potential is included by second order perturbation theory within the nearly free electron pseudopotential theory. The theory is applied to investigate the influence of periodic potential on the plasmon lineshape in simple metals and in semiconductors and comparison is made with experiment. In an attempt to explain remaining discrepancies between theory and experiment, various other effects are investigated based mostly on theories in the literature. These effects arise from many-body effects beyond the RPA, from the presence of phonons and from the polarizable core electrons.