title: Microscopic analysis of the valence band and impurity band theories of (Ga,Mn)As.
abstract: We analyze microscopically the valence and impurity band models of ferromagnetic (Ga,Mn)As. We find that the tight-binding Anderson approach with conventional parametrization and the full potential local-density approximation+U calculations give a very similar band structure whose microscopic spectral character is consistent with the physical premise of the k·p kinetic-exchange model. On the other hand, the various models with a band structure comprising an impurity band detached from the valence band assume mutually incompatible microscopic spectral character. By adapting the tight-binding Anderson calculations individually to each of the impurity band pictures in the single Mn impurity limit and then by exploring the entire doping range, we find that a detached impurity band does not persist in any of these models in ferromagnetic (Ga,Mn)As.
authors.affiliation: Institute of Physics ASCR, v.v.i., Na Slovance 2, 182 21 Praha 8, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Mašek
authors.forename: F
authors.initials: F
authors.lastname: Máca
authors.forename: J
authors.initials: J
authors.lastname: Kudrnovský
authors.forename: O
authors.initials: O
authors.lastname: Makarovsky
authors.forename: L
authors.initials: L
authors.lastname: Eaves
authors.forename: R P
authors.initials: RP
authors.lastname: Campion
authors.forename: K W
authors.initials: KW
authors.lastname: Edmonds
authors.forename: A W
authors.initials: AW
authors.lastname: Rushforth
authors.forename: C T
authors.initials: CT
authors.lastname: Foxon
authors.forename: B L
authors.initials: BL
authors.lastname: Gallagher
authors.forename: V
authors.initials: V
authors.lastname: Novák
authors.forename: Jairo
authors.initials: J
authors.lastname: Sinova
authors.forename: T
authors.initials: T
authors.lastname: Jungwirth