Abstract
The third-order non-linear response due to spin-flip transitions of electrons in asymmetric narrow-gap quantum wells with a spin-split energy spectrum is calculated. The resonant spectral dependences and the gate-voltage dependences of the third-order susceptibility are obtained. The efficiency of up-conversion of the microwave pumping into submillimetre radiation in the multi-well structure is estimated and the dependences on the incidence angle and on the polarization of pumping are presented.
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