Abstract
Puzzling disagreement between photoemission and optical findings in magnetically doped GaN and ZnO is explained within a generalized alloy theory. The strong coupling between valence-band holes and localized spins gives rise to a midgap Zhang–Rice-like state, to a sign reversal of the apparent exchange integral, and to an increase of the band gap with the magnetic ion concentration.
- Received 2 December 2007
DOI:https://doi.org/10.1103/PhysRevB.77.085208
©2008 American Physical Society