About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Paper
Reference-state density functional theory
Abstract
Many theoretical methods for N-electron systems use a reference state whose electronic density in general differs from that of the associated eigenstate. In contrast, the density functional theory of Kohn and Sham postulates a model reference system for which these two densities are identical. An alternative postulate, requiring the reference state to have maximum projection on the true wave function (the Brueckner-Brenig construction), is shown here to provide a theory in which the ground-state energy is a functional of the reference-state density. This revised formalism makes it possible to identify elements of the theory with specific formulas and concepts of formal many-body theory. In particular, the one-electron wave functions are in one-to-one correspondence with physical quasiparticles of a generalized Fermi-liquid theory, and the one-electron energies are Landau quasiparticle energies. © 1996 American Chemical Society.