Optical orientation of nuclei in nitrogen alloys GaAsN at room temperature

The intensity and the giant circular polarization of edge luminescence in a longitudinal magnetic field have been measured in nitrogen alloys GaAsN under circularly polarized pumping. It has been found that these dependences are shifted with respect to zero field by a value Beff. The magnitude of th...

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Bibliographic Details
Published in:arXiv.org 2012-10
Main Authors: Kalevich, V K, Afanasiev, M M, A Yu Shiryaev, A Yu Egorov
Format: Article
Language:English
Subjects:
Circular polarization
Conduction electrons
Electron spin
Nuclei (nuclear physics)
Optical pumping
Room temperature
Saturation
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Summary:The intensity and the giant circular polarization of edge luminescence in a longitudinal magnetic field have been measured in nitrogen alloys GaAsN under circularly polarized pumping. It has been found that these dependences are shifted with respect to zero field by a value Beff. The magnitude of the internal field Beff increases with increase in pumping intensity and reaches saturation (~250 Gauss) at great densities of excitation. The saturation of the Beff field with growth of pumping indicates that this is a field of nuclei, polarized dynamically due to hyperfine interaction with optically oriented deep paramagnetic centers, rather than a field of exchange interaction created on the center by spin-polarized photo-excited conduction electrons. The short time of nuclear polarization by electrons (
ISSN:2331-8422
DOI:10.48550/arxiv.1210.3302