Quasiparticles in Neon using the Faddeev Random Phase Approximation

Understand

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, rather than the Tamm-Dancoff framework employed in the third-order algebraic diagrammatic contruction [ADC(3)] method.
• The difference between these two approaches is studied, as well as the interplay between ladder and ring diagrams in the self-energy.