| e report our study of the far-infrared linear response of electron gases in graded GaAs/AlGaAs quantum well heterostructures. The structures studied included a heterojunction, a parabolic quantum well, and a well with a parabolic central region joined smoothly to linearly-graded edges. For the heterojunction and the parabolic well, we investigated the effects of periodic, lateral modulation of the electron density on the intra- and inter-subband excitations for electron gas widths ranging from well within the Fermi wavelength... |
