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VOLUME 21 (1975) | ISSUE 10 | PAGE 599
Observation of optical orientation of holes in semiconductors
A luminescence band near 1.86 eV is observed in л-GaAS crystals and is due to electronic transitions from the conduction band to the split-off valence band. The presence of circularly polarized luminescence in the case of circularly polarized pumping offers evidence of optical spin orientation of the holes in the split-off band.