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

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

2007-08-24

arxiv.org/abs/0708.3296v1

Phys. Rev. Lett. 100, 037204 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.100.037204

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.

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