Screened Interaction and Self-Energy in an Infinitesimally Polarized Electron Gas via the Kukkonen-Overhauser Method

Abstract

The screened electron-electron interaction $W_{σ, σ'}$ and the electron self-energy in an infinitesimally polarized electron gas are derived by extending the approach of Kukkonen and Overhauser. Various quantities in the expression for $W_{σ, σ'}$ are identified in terms of the relevant response functions of the electron gas. The self-energy is obtained from $W_{σ, σ'}$ by making use of the GW method which in this case represents a consistent approximation. Contact with previous calculations is made.