Abstract
Self-consistent calculations, maintaining only the quasiparticle part of the Green’s function , are reported for a wide class of materials, including small gap semiconductors and large gap insulators. We show that the inclusion of the attractive electron-hole interaction via an effective nonlocal exchange correlation kernel is required to obtain accurate band gaps in the framework of self-consistent calculations. If these are accounted for via vertex corrections in , the band gaps are found to be within a few percent of the experimental values.
- Received 21 June 2007
DOI:https://doi.org/10.1103/PhysRevLett.99.246403
©2007 American Physical Society