论文标题
电子气体中波动潜在计算的模型介电函数：关键评估
Model dielectric functions for fluctuation potential calculations in electron gas: a critical assessment
论文作者
论文摘要
在本文中，我们通过比较不同的建模方法报告了电子气体中介电函数计算的批判性评估。这项工作是由于介电函数是各种基于电子光谱的血浆特征的多个散射描述中的关键数量。从标准的随机相位近似（RPA）表达式开始，我们继续进行相关增强的RPA，然后抑制RPA模型。最后，我们使用Nevanlinna和内存函数方法从其矩中研究了介电函数的重建。我们发现内存函数方法是最有效的，具有高度灵活性和可定制性。
In this article, we report a critical assessment of dielectric function calculations in electron gas through the comparison of different modelling methods. This work is motivated by the fact that the dielectric function is a key quantity in the multiple scattering description of plasmon features in various electron-based spectroscopies. Starting from the standard random phase approximation (RPA) expression, we move on to correlation-augmented RPA, then damped RPA models. Finally, we study the reconstruction of the dielectric function from its moments, using the Nevanlinna and memory function approaches. We find the memory function method to be the most effective, being highly flexible and customizable.
