Abstract

Dyson orbitals play an important role in understanding quasi-particle effects in the correlated ground state of a many-particle system and are relevant for describing the Compton scattering cross section beyond the frameworks of the impulse approximation (IA) and the independent particle model (IPM). Here we discuss corrections to the Kohn-Sham energies due to quasi-particle effects in terms of Dyson orbitals and obtain a relatively simple local form of the exchange-correlation energy. Illustrative examples are presented to show the usefulness of our scheme.

Notes

Originally posted at http://arxiv.org/abs/cond-mat/0405167v1. Preprint of an article published in Journal of Physics and Chemistry of Solids, v.65 no.12, 2004.

Keywords

Dyson orbitals, Compton scattering, Kohn-Sham

Subject Categories

Condensed matter, Materials science, Quasiparticles (Physics)

Disciplines

Physics

Publication Date

2004

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