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As local density approximation positron calculations systematicallyunderestimate positron lifetimes when they are compared with their experimentalcounterparts, the generalized gradient approximation (GGA) for positrons wasintroduced in the 1990s, in analogy with the GGA for electrons. Newdevelopments in the GGA for positrons are summarized and presented here and itis also discussed how they affect and possibly improve calculated positronlifetimes. In particular, these new GGA approaches are based on the recentperturbed hypernetted-chain and quantum Monte Carlo results.

Gradient correction scheme for bulk and defect positron states in materials: New developments