Abstract
We report the fabrication characterization and physics of selectively-doped wide parabolic A1GaAs wells which contain low-disorder nearly uniform-density dilute electron systems. The electron layer in these structures has a thickness of ''''lOOOA and an effective three-dimensional density of 1x1016cm3. These structures provide a rather unique system for the studies of the single-electron as well as many-body effects in space-charge layers in semiconductors. Examples of new physical phenomena observed in these systems are presented these include: (a) the observation of plasma-shifted cyclotron resonance and (b) the collapse of the fractional quantum Hall effect in systems with large electron layer thickness. We also present the fabrication and magnetotransport measurements in a novel selectively-doped superlattice produced in a wide parabolic quantum well with a superimposed periodic potential.
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