Kohn-Sham band gaps and potentials of solids from the optimised effective potential method within the random phase approximation

Abstract

We present an implementation of the optimised effective potential (OEP) scheme for the exact-exchange (EXX) and random phase approximation (RPA) energy functionals and apply these methods to a range of bulk materials. We calculate the Kohn-Sham (KS) potentials and the corresponding band gaps and compare them to the potentials obtained by standard local density approximation (LDA) calculations. The KS gaps increase upon going from the LDA to the OEP in the RPA and finally to the OEP for EXX. This can be explained by the different depth of the potentials in the bonding and interstitial regions. To obtain the true quasi-particle gaps the derivative discontinuities or $G_0{W}_0$ corrections need to be added to the RPA-OEP KS gaps. The predicted $G_0{W}_0$@RPA-OEP quasi-particle gaps are about 5% too large compared to the experimental values. However, compared to $G_0{W}_0$ calculations based on local or semi-local functionals, where the errors vary between different materials, we obtain a rather consistent description among all the materials.

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• Assessment of the second-order statically screened exchange correction to the random phase approximation for correlation energies
• Approximations to the exact exchange potential: KLI versus semilocal
• Optimized effective potential method and application to static RPA correlation
• Local Exchange-Correlation Potentials by Density Inversion in Solids
• Self-consistent random phase approximation and optimized hybrid functionals for solids
• Optimized effective potential forces with the plane-wave and pseudopotential method