@article {268,
	title = {Nonlinear response of quantum-confined electrons in nonparabolic subbands},
	journal = {Journal of Applied Physics},
	volume = {80},
	number = {4},
	year = {1996},
	note = {7},
	month = {Aug 15},
	pages = {2533-2535},
	abstract = {<p>We show that quantum confinement can dramatically alter the density-dependence of the third-order susceptibility, chi(NP)((3)) that arises from band nonparabolicity. Our results predict an oscillatory dependence of the efficiencies for third-harmonic generation and four-wave mixing on the subband occupation of quantum wells, and for narrow wells with high charge densities predict an enhancement over the bulk susceptibility. We also make a simple estimate of the fields required to saturate this nonparabolicity contribution to chi((3)). We discuss these results in light of recent experiments on third-harmonic generation from narrow-gap quantum wells at frequencies of similar to 1 THz, and show that nonparabolicity may not be the only nonlinearity contributing to the large chi((3)) observed. (C) 1996 American Institute of Physics.</p>},
	isbn = {0021-8979},
	doi = {10.1063/1.363040},
	author = {Markelz, A. G. and Gwinn, E. G.}
}
