Quasi-local-density approximation for a van der Waals energy functional

Details Quasi-local-density approximation for a van der Waals energy functional Quasi-local-density approximation for a van der Waals energy functional

2003-11-17

arxiv.org/abs/cond-mat/0311371v1

p. 121 in "Topics in Condensed Matter Physics" ed. M. P. Das (Nova Science Publishers, Commack, New York 1994, ISBN 1-56072-18

Physics

Condensed Matter

Soft Condensed Matter

19 pp., 1 embedded figure. This is a reprinting of a chapter that apeared in a festschrift volume for Jay Mahanty, now out of

Scientific paper

We discuss a possible form for a theory akin to local density functional theory, but able to produce van der Waals energies in a natural fashion. The usual Local Density Approximation (LDA) for the exchange and correlation energy $E_{xc}$ of an inhomogeneous electronic system can be derived by making a quasilocal approximation for the {\it interacting} density-density response function $\chi (\vec{r},\vec{r} ^{\prime},\omega)$, then using the fluctuation-dissipation theorem and a Feynman coupling-constant integration to generate $E_{xc}$. The first new idea proposed here is to use the same approach except that one makes a quasilocal approximation for the {\it bare} response $\chi ^{0}$, rather than for $\chi $. The interacting response is then obtained by solving a nonlocal screening integral equation in real space. If the nonlocal screening is done at the time-dependent Hartree level, then the resulting energy is an approximation to the full inhomogeneous RPA energy: we show here that the inhomogeneous RPA correlation energy contains a van der Waals term for the case of widely-separated neutral subsystems. The second new idea is to use a particularly simple way of introducing LDA-like local field corrrections into the screening equations, giving a theory which should remain reasonable for all separations of a pair of subsystems, encompassing both the van der Waals limit much as in RPA and the bonding limit much as in LDA theory.

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