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Subsurface dimerization in III-V semiconductor (001) surfaces.

C Kumpf1, L D Marks, D Ellis

  • 1Condensed Matter Physics and Chemistry Department, Risø National Laboratory, DK-4000 Roskilde, Denmark. kumpf@physik.uni-wuerzburg.de

Physical Review Letters
|May 1, 2001
PubMed
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We reveal the atomic structure of III-V semiconductor surfaces, finding subsurface dimerization, not surface dimers. This discovery unifies the understanding of (001)-c(8 x 2) reconstructions in these materials.

Area of Science:

  • Materials Science
  • Surface Science
  • Solid State Physics

Background:

  • The (001)-c(8 x 2) reconstruction is common in III-V semiconductors.
  • Previous models often assumed surface group III dimers were prominent.

Purpose of the Study:

  • To determine the atomic structure of c(8 x 2) reconstructions on InSb, InAs, and GaAs (001) surfaces.
  • To challenge existing models of surface dimerization.

Main Methods:

  • Surface X-ray diffraction using direct methods.
  • Analysis of atomic occupancies in four distinct surface sites.

Main Results:

  • Subsurface dimerization of group III atoms in the second bilayer was observed.
  • Significant surface atom rearrangement forms linear arrays above the dimers.

Related Experiment Videos

  • A unified model describing the (001)-c(8 x 2) reconstructions was developed.

    • Conclusions:

    • Contrary to common belief, surface dimers are not prominent.
    • Subsurface dimerization and subsequent surface rearrangement govern the reconstruction.
    • A single model effectively describes reconstructions across different III-V semiconductors.