Quasiparticles in Neon using the Faddeev Random Phase Approximation
Quasiparticles in Neon using the Faddeev Random Phase Approximation
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使用 Faddeev 随机相位近似计算氖气中的准粒子
DOI：
10.1103/physreva.76.052503
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发表时间：
2007
影响因子：
2.9
通讯作者：
W. H. Dickhoff
中科院分区：
文献类型：
--
作者：
C. Barbieri;D. Neck;W. H. Dickhoff
通过Faddeev方程展开电子自能，计算了封闭壳层氖原子的光谱函数。该方法描述了单粒子自由度与关联双电子、双空穴和电子-空穴对的耦合。激发光谱是使用随机相位近似（RPA），而不是Tamm-Dancoff框架中采用的三阶代数图解构造方法。这两种方法之间的差异进行了研究，以及梯形图和环形图之间的相互作用，在自能。用Faddeev RPA方案计算了电离能和基态能量，得到了满意的结果，该方案也适用于高密度电子气。
The spectral function of the closed-shell neon atom is computed by expanding the electron self-energy through a set of Faddeev equations. This method describes the coupling of single-particle degrees of freedom with correlated two-electron, two-hole, and electron-hole pairs. The excitation spectra are obtained using the random-phase approximation (RPA), rather than the Tamm-Dancoff framework employed in the third-order algebraic diagrammatic construction method. The difference between these two approaches is studied, as well as the interplay between ladder and ring diagrams in the self-energy. Satisfactory results are obtained for the ionization energies as well as the energy of the ground state with the Faddeev RPA scheme, which is also appropriate for the high-density electron gas.