Fabrication of quasi-three-dimensional electron systems and superlattices in wide parabolic wells

M. Santos, J. Jo, M. Shayegan, A. M. Lanzillotto

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4 Scopus citations

Abstract

We report the realization of quasi-three-dimensional electron systems in selectively-doped wide parabolic quantum wells, focusing on a novel superlattice which contains a high-mobility ( ≈ 1.1×105 cm2/V⋯s at 4 K) degenerate electron system. This molecular beam epitaxy grown structure is a wide undoped AlxGa1-xAs well bounded by undoped (spacer) and doped layers of AlyGa1-yAs(y > x) on both sides. The alloy composition in the well is graded in a way that results in a parabolic potential with a sinusoidal modulation superimposed on it. Once transferred into this well, the electrons screen the parabolic potential and an electron system with a modulated charge density profile is obtained. We present self-consistent quantum mechanical calculations of the electronic system and our characterization of the structure by secondary ion mass spectrometry and magnetotransport measurements.

Original languageEnglish (US)
Pages (from-to)366-370
Number of pages5
JournalJournal of Crystal Growth
Volume111
Issue number1-4
DOIs
StatePublished - May 2 1991

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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