Abstract
We derive a nonlocal correlation functional that adequately describes van der Waals interactions not only in the asymptotic long-range regime but also at short range. Unlike its precursor, developed by Langreth, Lundqvist, and co-workers, the new functional has a simple analytic form, finite for all interelectron separations, well behaved in the slowly varying density limit, and generalized to spin-polarized systems.
- Received 13 May 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.063004
©2009 American Physical Society