均匀电子气体
Uniform electron gases
摘要:
我们表明,传统的概念的均匀电子气(UEG)-均匀系统的有限密度,由无限数量的电子在一个无限的体积-是不足以模拟UEGs出现在有限的系统。我们认为,在一般情况下,UEG的特征在于至少有两个参数,\textit{viz.}通常的单电子密度参数$ρ$和一个新的双电子参数$η$。我们概述了一个系统的策略,以确定一个新的密度泛函$E(ρ,η)$在整个频谱的可能的$ρ$和$η$值。
英文摘要:
We show that the traditional concept of the uniform electron gas (UEG) --- a homogeneous system of finite density, consisting of an infinite number of electrons in an infinite volume --- is inadequate to model the UEGs that arise in finite systems. We argue that, in general, a UEG is characterized by at least two parameters, \textit{viz.} the usual one-electron density parameter $ρ$ and a new two-electron parameter $η$. We outline a systematic strategy to determine a new density functional $E(ρ,η)$ across the spectrum of possible $ρ$ and $η$ values.
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