Observation of strong-coupling effects in a diluted magnetic semiconductor Ga1-xFexN.
The giant Zeeman splitting of free excitons is measured in Ga(1-x)Fe(x)N. Magneto-optical and magnetization data imply the ferromagnetic sign and a reduced magnitude of the effective p-d exchange energy governing the interaction between Fe(3+) ions and holes in GaN, N_{0}beta(app)=+0.5+/-0.2 eV. This finding corroborates the recent suggestion that the strong p-d hybridization specific to nitrides and oxides leads to significant renormalization of the valence band exchange splitting.
Pacuski
W
W
Institute of Experimental Physics, University of Warsaw, Hoza 69, Warsaw, Poland. Wojciech.Pacuski@fuw.edu.pl
Kossacki
P
P
Ferrand
D
D
Golnik
A
A
Cibert
J
J
Wegscheider
M
M
Navarro-Quezada
A
A
Bonanni
A
A
Kiecana
M
M
Sawicki
M
M
Dietl
T
T