Abstract
Band structures of GaAsN and GaSbN alloys are studied in the framework of the density functional theory within the hybrid functional scheme (HSE06). We find that the scheme gives a clear improvement over the traditional (semi)local functionals in describing, in a qualitative agreement with experiments, the bowing of electron energy band gap in GaAsN alloys. In the case of GaSbN alloys, the hybrid functional used makes the study of band structures possible ab initio without any empirical parameter fitting. We explain the trends in the band gap reductions in the two materials that result mainly from the positions of the nitrogen-induced states with respect to the bottoms of the bulk conduction bands.
- Received 18 August 2011
DOI:https://doi.org/10.1103/PhysRevB.85.085134
©2012 American Physical Society