CORRELATION ENERGY IN SMALL JELLIUM CLUSTERS

C. Guet and S.A. Blundell
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C. Guet: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
S.A. Blundell: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 395-397

Abstract: The correlation energy of finite systems of electrons in a neutralizing spherical positively charged background (jellium) is investigated within various approximations. The correlation energy is defined with respect to the Hartree–Fock energy (with exact treatment of exchange). On one hand, the exact second-order energy contribution is calculated from many-body perturbation theory. On the other hand, a quasi-boson approximation to harmonic order only allows one to estimate the RPA ground-state correlation energy and to emphasize the relative importance of Coulomb-interaction screening corrections (ring diagrams). One finds that the second-order contribution accounts for most of the correlation energy. Comparisons with other approaches, such as density-functional theory and CI calculations, confirm this assertion.

Date: 1996
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DOI: 10.1142/S0218625X96000711

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