Abstract
Optical pumping of electrons in the non-magnetic alloys Hg0.31Cd0.69Te and Hg0.39Cd0.61Te at 4.2 K was studied by circularly polarized excitation with photon energy somewhat higher than the energy gap and compared with optical pumping efficiency for the semi-magnetic alloy Hg0.77Mn0.23Te with intermediate values of the band parameter. Spin relaxation times were estimated for semi-magnetic and non-magnetic alloys. The experimental values were compared with the theory of spin relation of electrons in semiconductors. The mechanism of spin relaxation in non-magnetic alloys with 0.61<x<0.69 at 4.2 K was shown to be the Bir-Aronov-Pikus electron-hole exchange interaction, while the electron spin relaxation in the semi-magnetic alloy goes through the electron-Mn2+ exchange interaction. Finally, the authors apply the optical pumping technique to evaluate some parameters of electron recombination through the deep impurity centres.
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