Efficient First-Principles Approach with a Pseudohybrid Density Functional for Extended Hubbard Interactions

Abstract

For fast and accurate calculations of band gaps of solids, we present an {\it ab initio} method that extends the density functional theory plus on-site Hubbard interaction (DFT+$U$) to include inter-site Hubbard interaction ($V$). This formalism is appropriate for considering various interactions such as a local Coulomb repulsion, covalent hybridizations, and their coexistence in solids. To achieve self-consistent evaluations of $U$ and $V$, we adapt a recently proposed Agapito-Curtarolo-Buongiorno Nardelli pseudohybrid functional for DFT$+U$ to implement a density functional of $V$ and obtain band gaps of diverse bulk materials as accurate as those from $GW$ or hybrid functionals methods with a standard DFT computational cost. Moreover, we also show that computed band gaps of few layers black phosphorous and Si(111)-($2\times 1$) surface agree with experiments very well, thus meriting the new method for large-scale as well as high throughput calculations with higher accuracy.

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