Journal
JETP LETTERS
Volume 96, Issue 9, Pages 567-571Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364012210060
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Funding
- Russian Academy of Sciences
- Russian Foundation for Basic Research
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The intensity and 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 B (eff). The magnitude of the internal field B (eff) increases with the pumping intensity and reaches saturation (a parts per thousand 250 G) at large excitation densities. The saturation of the B (eff) 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 (< 15 mu s), measured under modulation of circular polarization of the exciting light with high frequency, points to a small number of nuclei undergoing hyperfine interaction with an electron localized at a center.
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