Physics – Chemical Physics
Scientific paper
2004-10-10
Phys. Rev. A 70, 062505 (2004)
Physics
Chemical Physics
18 pages, 14 figures, to be published in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.70.062505
By splitting the Coulomb interaction into long-range and short-range components, we decompose the energy of a quantum electronic system into long-range and short-range contributions. We show that the long-range part of the energy can be efficiently calculated by traditional wave function methods, while the short-range part can be handled by a density functional. The analysis of this functional with respect to the range of the associated interaction reveals that, in the limit of a very short-range interaction, the short-range exchange-correlation energy can be expressed as a simple local functional of the on-top pair density and its first derivatives. This provides an explanation for the accuracy of the local density approximation (LDA) for the short-range functional. Moreover, this analysis leads also to new simple approximations for the short-range exchange and correlation energies improving the LDA.
Colonna Francois
Savin Andreas
Toulouse Julien
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