A More Accurate Generalized Gradient Approximation for Solids

Details A More Accurate Generalized Gradient Approximation for Solids A More Accurate Generalized Gradient Approximation for Solids

2005-07-29

arxiv.org/abs/cond-mat/0508004v3

Physics

Condensed Matter

Materials Science

5 pages, corrected the errors of the sublimation energy of Ih ice

Scientific paper

10.1103/PhysRevB.73.235116

We present a new nonempirical density functional generalized gradient approximation (GGA) that gives significant improvements for lattice constants, crystal structures, and metal surface energies over the most popular Perdew-Burke-Ernzerhof (PBE) GGA. The new functional is based on a diffuse radial cutoff for the exchange-hole in real space, and the analytic gradient expansion of the exchange energy for small gradients. There are no adjustable parameters, the constraining conditions of PBE are maintained, and the functional is easily implemented in existing codes.

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