Density dependence of the plasmon dispersion in alkali metals
Density dependence of the plasmon dispersion in alkali metals
复制标题
碱金属中等离激元色散的密度依赖性
DOI：
10.1088/0953-8984/6/10/019
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
K. Takayanagi
中科院分区：
文献类型：
--
作者：
E. Lipparini;S. Stringari;K. Takayanagi
我们使用求和规则方法研究了电子相关性对碱金属中等离激元色散的作用。在费米液体的朗道理论框架中计算单电子对对激发光谱低能部分的贡献，并用于估计等离激元对压缩性和规则的贡献。使用文献中最近提出的非局部有效相互作用（g 矩阵）来计算等离激元对 f-sum 规则的贡献。该分析解释了实验数据显示的色散系数 α 的强烈密度依赖性。还估计了多对激发的平均能量。
We investigate the role of electron correlations on the plasmon dispersion in alkali metals using a sum rule approach. The single pair contribution to the low-energy part of the excitation spectrum is calculated in the framework of the Landau theory of Fermi liquids and used to estimate the plasmon contribution to the compressibility sum rule. The plasmon contribution to the f-sum rule is calculated employing a non-local effective interaction (g-matrix) recently proposed in the literature. The analysis accounts for the strong density dependence of the dispersion coefficient alpha exhibited by experimental data. The average energy of multipair excitations is also estimated.