<?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%">Craig, K.</style></author><author><style face="normal" font="default" size="100%">Galdrikian, B.</style></author><author><style face="normal" font="default" size="100%">Heyman, J. N.</style></author><author><style face="normal" font="default" size="100%">Markelz, A. G.</style></author><author><style face="normal" font="default" size="100%">Williams, J. B.</style></author><author><style face="normal" font="default" size="100%">Sherwin, M. S.</style></author><author><style face="normal" font="default" size="100%">Campman, K.</style></author><author><style face="normal" font="default" size="100%">Hopkins, P. F.</style></author><author><style face="normal" font="default" size="100%">Gossard, A. C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Undressing a collective intersubband excitation in a quantum well</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review Letters</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%">Mar 25</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">13</style></number><volume><style face="normal" font="default" size="100%">76</style></volume><pages><style face="normal" font="default" size="100%">2382-2385</style></pages><isbn><style face="normal" font="default" size="100%">0031-9007</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 have experimentally measured the 1-2 intersubband absorption in a single 40 nm wide modulation-doped Al0.3Ga0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80 cm(-1) (10 meV or 2.4 THz), nearly 30% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Zaluzny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.&lt;/p&gt;</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:A1996UB14800044</style></accession-num><notes><style face="normal" font="default" size="100%">Sherwin, Mark S/Q-4762-2017&lt;br/&gt;Sherwin, Mark S/0000-0002-3869-1893; Markelz, Andrea/0000-0003-0443-4319&lt;br/&gt;78</style></notes></record><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%">Sherwin, M. S.</style></author><author><style face="normal" font="default" size="100%">Craig, K.</style></author><author><style face="normal" font="default" size="100%">Galdrikian, B.</style></author><author><style face="normal" font="default" size="100%">Heyman, J.</style></author><author><style face="normal" font="default" size="100%">Markelz, A.</style></author><author><style face="normal" font="default" size="100%">Campman, K.</style></author><author><style face="normal" font="default" size="100%">Fafard, S.</style></author><author><style face="normal" font="default" size="100%">Hopkins, P. F.</style></author><author><style face="normal" font="default" size="100%">Gossard, A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">NONLINEAR QUANTUM DYNAMICS IN SEMICONDUCTOR QUANTUM-WELLS</style></title><secondary-title><style face="normal" font="default" size="100%">Physica D-Nonlinear Phenomena</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1995</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May 15</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">1-3</style></number><volume><style face="normal" font="default" size="100%">83</style></volume><pages><style face="normal" font="default" size="100%">229-242</style></pages><isbn><style face="normal" font="default" size="100%">0167-2789</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 discuss recent measurements of the nonlinear response of electrons in wide quantum wells driven by intense electromagnetic radiation at terahertz frequencies. The theme is the interplay of quantum mechanics, strong periodic driving, the electron-electron interaction and dissipation. We discuss harmonic generation from an asymmetric double quantum well in which the effects of dynamic screening are important. Measurements and theory are found to be in good agreement. We also discuss intensity-dependent absorption in a 400 Angstrom square quantum well. A new nonlinear quantum effect occurs, in which the frequency at which electromagnetic radiation is absorbed shifts to the red with increasing intensity. The preliminary experimental results are in agreement with a theory by Zaluzny, in which the source of the nonlinearity is the self-consistent potential in the Hartree approximation for the electron dynamics.&lt;/p&gt;</style></abstract><accession-num><style face="normal" font="default" size="100%">WOS:A1995RA41200018</style></accession-num><notes><style face="normal" font="default" size="100%">Sherwin, Mark S/Q-4762-2017&lt;br/&gt;Sherwin, Mark S/0000-0002-3869-1893; Markelz, Andrea/0000-0003-0443-4319&lt;br/&gt;14th Annual International Conference of the Center-for-Nonlinear-Studies - Quantum Complexity in Mesoscopic Systems&lt;br/&gt;May 16-20, 1994&lt;br/&gt;Los alamos, nm&lt;br/&gt;Ctr nonlinear studies&lt;br/&gt;34</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>10</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sherwin, M. S.</style></author><author><style face="normal" font="default" size="100%">Asmar, N. G.</style></author><author><style face="normal" font="default" size="100%">Bewley, W. W.</style></author><author><style face="normal" font="default" size="100%">Craig, K.</style></author><author><style face="normal" font="default" size="100%">Felix, C. L.</style></author><author><style face="normal" font="default" size="100%">Galdrikian, B.</style></author><author><style face="normal" font="default" size="100%">Gwinn, E. G.</style></author><author><style face="normal" font="default" size="100%">Markelz, A.G.</style></author><author><style face="normal" font="default" size="100%">Gossard, A. C.</style></author><author><style face="normal" font="default" size="100%">Hopkins, P. F.</style></author><author><style face="normal" font="default" size="100%">Sundaram, M.</style></author><author><style face="normal" font="default" size="100%">Birnir, B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Far-infrared nonlinear response of electrons in semiconductor nanostructures</style></title><secondary-title><style face="normal" font="default" size="100%">SPIE Proceedings</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1993</style></year></dates><volume><style face="normal" font="default" size="100%">1854</style></volume><pages><style face="normal" font="default" size="100%">36-47</style></pages><language><style face="normal" font="default" size="100%">eng</style></language></record></records></xml>