title: Levels of self-consistency in the GW approximation.
abstract: We perform GW calculations on atoms and diatomic molecules at different levels of self-consistency and investigate the effects of self-consistency on total energies, ionization potentials, and particle number conservation. We further propose a partially self-consistent GW scheme in which we keep the correlation part of the self-energy fixed within the self-consistency cycle. This approximation is compared to the fully self-consistent GW results and to the GW(0) and the G(0)W(0) approximations. Total energies, ionization potentials, and two-electron removal energies obtained with our partially self-consistent GW approximation are in excellent agreement with fully self-consistent GW results while requiring only a fraction of the computational effort. We also find that self-consistent and partially self-consistent schemes provide ionization energies of similar quality as the G(0)W(0) values but yield better total energies and energy differences.
authors.affiliation: Department of Physics, Nanoscience Center, University of Jyvaskyla, Jyvaskyla FIN 40014, Finland. adrian.stan@jyu.fi
authors.forename: Adrian
authors.initials: A
authors.lastname: Stan
authors.forename: Nils Erik
authors.initials: NE
authors.lastname: Dahlen
authors.forename: Robert
authors.initials: R
authors.lastname: van Leeuwen