Effective Heisenberg exchange integrals of diluted magnetic semiconductors determined within realistic multi-band tight-binding models

Stefan Barthel, Gerd Czycholl, Georges Bouzerar

Diluted magnetic semiconductors (DMS) like Ga${}_{1-x}$Mn${}_x$As are described by a realistic tight-binding model (TBM) for the (valence) bands of GaAs, by a Zener (J-)term modeling…