Abstract
The absorption of far-infrared radiation due to electron transitions between spin-split states in nonsymmetric quantum wells excited by a plane-polarized electric field is considered. It is shown that a relative contribution of the exchange renormalization of spin-flip transitions decreases as the concentration of two-dimensional electrons increases. The shape of the absorption peak under resonance transitions is calculated for the case when the line broadening is determined using scattering by static defects. The effect of the Coulomb interaction on the shape of the peak is taken into account, and the suppression of spin-flip absorption due to temperature growth is described.
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