title: Potential functionals: dual to density functionals and solution to the v-representability problem.
abstract: A functional of external potentials and its variational principle for the ground-state energy is constructed. This potential functional formulation is dual to the density functional approach and provides a solution to the v-representability problem in the original Hohenberg-Kohn theory. A second potential functional for Kohn-Sham noninteracting systems establishes the foundation for the optimized effective potential approach and results in efficient approaches for ensemble Kohn-Sham calculations.
authors.affiliation: Department of Chemistry, Duke University, Durham, North Carolina 27708, USA.
authors.forename: Weitao
authors.initials: W
authors.lastname: Yang
authors.forename: Paul W
authors.initials: PW
authors.lastname: Ayers
authors.forename: Qin
authors.initials: Q
authors.lastname: Wu