Simple correction to bandgap in IV and III-V semiconductors: an improved first-principles local density functional theory

Abstract

We report results from a fast, efficient, and first-principles full-potential N${}^{th}$-order muffin-tin orbital (FP-NMTO) method combined with van Leeuwen-Baerends correction to local density exchange-correlation potential. We show that more complete and compact basis set is critical in improving the electronic and structural properties. We exemplify the self-consistent FP-NMTO calculations on group IV and III-V semiconductors. Notably, predicted bandgaps, lattice constants, and bulk moduli are in good agreement with experiments (e.g., we find for Ge $0.86e$V, $5.57$~Å, $75$~GPa vs. measured $0.74e$V, $5.66$~Å, $77.2$~GPa). We also showcase its application to the electronic properties of 2-dimensional $h-$BN and $h-$SiC, again finding good agreement with experiments.

11 pages, 7 figures, 3 table