Publications [#235154] of Weitao Yang

Journal Articles

1. Zhang, Y; Yang, W, Perspective on "Density-functional theory for fractional particle number: Derivative discontinuities of the energy", Theoretical Chemistry Accounts, vol. 103 no. 3-4 (January, 2000), pp. 346-348, SPRINGER, ISSN 1432-881X [Gateway.cgi], [doi]
   (last updated on 2026/01/17)

   Abstract:
   This paper provides an overview of the title paper by Perdew, Parr, Levy and Balduz [Phys Rev Lett 49:1691 (1982)]. The title paper extended density functional theory to fractional electron number by an ensemble approach and proved that the energy is a series of straight lines interpolating its values at integer numbers of electrons. It also established that the highest-occupied exact Kohn-Sham orbital energy is the negative of the ionization energy, and showed that the exchange-correlation potential jumps by a constant as the number of electrons increases by an integer. These results are fundamental and continue to inspire developments in density functional theory.