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- W2079676739 abstract "When nuclear spin order is induced by optical excitation near the band gap of a semiconductor such as GaAs, the effect is referred to as optical pumping. This paper presents measurements of the optical pumping rate in semi-insulating GaAs over the magnetic field range of 0-24 T at temperatures of 1.5 K and 4.2 K. The enhanced nuclear polarization was sampled by radio wave detected NMR. The data were recorded using Bitter- type magnets which permitted rapid ramping between the pumping and sampling fields in a time short compared to the nuclear spin lattice relaxation time in the dark. The field dependence has been fitted to a relaxation model which includes spin diffusion and dark relaxation terms. Fits were obtained by fixing the g factor to its literature value. The fitted parameters include the correlation time for electron spin-density fluctuations, the average hyperfine field, and the nuclear spin diffusion coefficient." @default.
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- W2079676739 date "1997-03-15" @default.
- W2079676739 modified "2023-09-26" @default.
- W2079676739 title "Magnetic-field dependence of the optical Overhauser effect in GaAs" @default.
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- W2079676739 doi "https://doi.org/10.1103/physrevb.55.7824" @default.
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