A uniqueness theorem in a density-matrix functional theory

Details A uniqueness theorem in a density-matrix functional theory A uniqueness theorem in a density-matrix functional theory

2005-05-29

arxiv.org/abs/cond-mat/0505703v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, no figure

Scientific paper

Uniqueness of effective interaction defined in an extension of the Kohn-Sham theory is proved, if the model with a non-degenerate ground state exists and to reproduce a correlation function as well as the single-particle density of an electron system. The two-body interaction term is regarded as a Hubbard-type short range interaction term. The interaction strength is a functional of an element of a two-body reduced density matrix of the electron system. The uniqueness theorem gives a basic principle for effective description of electron systems.

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