Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces

Details Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces

2009-01-25

arxiv.org/abs/0901.3871v1

Physics

Condensed Matter

Materials Science

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.79.075126

We propose a generalized gradient approximation (GGA) for the angle- and system-averaged exchange-correlation hole of a many-electron system. This hole, which satisfies known exact constraints, recovers the PBEsol (Perdew-Burke-Ernzerhof for solids) exchange-correlation energy functional, a GGA that accurately describes the equilibrium properties of densely packed solids and their surfaces. We find that our PBEsol exchange-correlation hole describes the wavevector analysis of the jellium exchange-correlation surface energy in agreement with a sophisticated time-dependent density-functional calculation (whose three-dimensional wavevector analysis we report here).

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