Vertex Corrections for Positive-Definite Spectral Functions of Simple Metals
Vertex Corrections for Positive-Definite Spectral Functions of Simple Metals
We present a systematic study of vertex corrections in a homogeneous electron gas at metallic densities. The vertex diagrams are built using a recently proposed positive-definite diagrammatic expansion for the spectral function. The vertex function not only provides corrections to the well known plasmon and particle-hole scatterings, but also gives …