Quasi-three-dimensional electron systems and superlattices in wide parabolic wells: fabrication and physics

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We report the fabrication, characterization, and physics of selectively-doped, wide parabolic AlGaAs wells which contain low-disorder, nearly uniform-density, dilute electron systems. The electron layer in these structures has a thickness of approx. 1000 angstrom and an effective three-dimensional density of approx. 1×1016cm-3. 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.

Original languageEnglish (US)
Pages (from-to)228-239
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberpt 1
StatePublished - 1991
EventPhysical Concepts of Materials for Novel Optoelectronic Device Applications II: Device Physics and Applications - Aachen, Ger
Duration: Oct 28 1990Nov 2 1990

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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