An improved exchange-correlation potential for polarizability and dissociation in DFT

Details An improved exchange-correlation potential for polarizability and dissociation in DFT An improved exchange-correlation potential for polarizability and dissociation in DFT

2006-08-07

arxiv.org/abs/cond-mat/0608174v2

Physics

Condensed Matter

Materials Science

4 pages, 3 figures; to appear in JCP

Scientific paper

10.1063/1.2741243

We propose a novel approach to the problem of polarizabilities and dissociation in electric fields from the static limit of the Vignale-Kohn (VK) functional. We consider the response to the purely scalar part of the VK response potential.This potential has ground-state properties that notably improve over the full VK response density and over usual (semi-)local functionals. The correct qualitative behavior of our potentials means that it is expected to work well for polarizabilities in cases such as the H$_2$ chain, and it will also correctly dissociate open-shell fragments in a field.

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