Arbitrary Choice of Basic Variables in Density Functional Theory. II. Illustrative Applications

Details Arbitrary Choice of Basic Variables in Density Functional Theory. II. Illustrative Applications Arbitrary Choice of Basic Variables in Density Functional Theory. II. Illustrative Applications

2003-02-05

arxiv.org/abs/cond-mat/0302093v2

Physics

Condensed Matter

Materials Science

27 pages

Scientific paper

10.1103/PhysRevB.69.165118

Our recent theory (Ref. 1) enables us to choose arbitrary quantities as the basic variables of the density functional theory. In this paper we apply it to several cases. In the case where the occupation matrix of localized orbitals is chosen as a basic variable, we can obtain the single-particle equation which is equivalent to that of the LDA+U method. The theory also leads to the Hartree-Fock-Kohn-Sham equation by letting the exchange energy be a basic variable. Furthermore, if the quantity associated with the density of states near the Fermi level is chosen as a basic variable, the resulting single-particle equation includes the additional potential which could mainly modify the energy-band structures near the Fermi level.

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