<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Markelz, A. G.</style></author><author><style face="normal" font="default" size="100%">Gwinn, E. G.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Nonlinear response of quantum-confined electrons in nonparabolic subbands</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Applied Physics</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1996</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Aug 15</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">4</style></number><volume><style face="normal" font="default" size="100%">80</style></volume><pages><style face="normal" font="default" size="100%">2533-2535</style></pages><isbn><style face="normal" font="default" size="100%">0021-8979</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;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.&lt;/p&gt;</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:A1996VD53200087</style></accession-num><notes><style face="normal" font="default" size="100%">7</style></notes></record></records></xml>