Abstract
Time-resolved measurements of the magneto-optical absorption due to photoexcited electrons have been carried out in order to investigate the relaxation of spin hot electrons in p-type InSb samples. For a sample with an excess carrier concentration of 5.8×1012 cm-3, the spin flipping time from the O- to the O+-Landau subband was found to be as long as 3.5 µs at 1.6–4.2 K. It is primarily determined by donor impurity scattering and is independent of their charge states. The spin property of electrons is important in the recombination between the conduction band and the acceptor. Other electron decay processes are also discussed with the help of experimental results under pulsed photoexcitation and under quasi-steady state excitation.
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