Observation of strong-coupling effects in a diluted magnetic semiconductor (Ga,Fe)N

Abstract

A direct observation of the giant Zeeman splitting of the free excitons in (Ga,Fe)N is reported. The magnetooptical 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.

4 pages, 2 figures

References in corpus (7)

• Paramagnetic GaN:Fe and ferromagnetic (Ga,Fe)N - relation between structural, electronic, and magnetic properties
• Effect of the s,p-d exchange interaction on the excitons in (Zn,Co)O epilayers
• Ferromagnetism of magnetic semiconductors--Zhang-Rice limit
• High-energy spectroscopic study of the III-V nitride-based diluted magnetic semiconductor Ga${}_{1-x}$Mn${}_x$N
• Non-perturbative $J_{pd}$ model and ferromagnetism in dilute magnets
• Excitonic giant Zeeman effect in GaN:Mn^3+
• The Crossover from Impurity to Valence Band in Diluted Magnetic Semiconductors: The Role of the Coulomb Attraction by Acceptor

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