Abstract
Valence-subband nonparabolicity is shown theoretically to lead to nonlinearities associated with terahertz third-harmonic generation in strained -type quantum wells. For strained InAs quantum wells it is found that the corresponding value of can be as large as . The predicted values of are in the range of those associated with intersubband transitions in the mid-infrared region of the spectrum.
© 2001 Optical Society of America
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