title: Conjugate-gradient optimization method for orbital-free density functional calculations.
abstract: Orbital-free density functional theory as an extension of traditional Thomas-Fermi theory has attracted a lot of interest in the past decade because of developments in both more accurate kinetic energy functionals and highly efficient numerical methodology. In this paper, we developed a conjugate-gradient method for the numerical solution of spin-dependent extended Thomas-Fermi equation by incorporating techniques previously used in Kohn-Sham calculations. The key ingredient of the method is an approximate line-search scheme and a collective treatment of two spin densities in the case of spin-dependent extended Thomas-Fermi problem. Test calculations for a quartic two-dimensional quantum dot system and a three-dimensional sodium cluster Na216 with a local pseudopotential demonstrate that the method is accurate and efficient.
authors.affiliation: Department of Chemistry, Duke University, Durham, North Carolina 27708-0354, USA.
authors.forename: Hong
authors.initials: H
authors.lastname: Jiang
authors.forename: Weitao
authors.initials: W
authors.lastname: Yang