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Indium-indium pair correlation and surface segregation in InGaAs alloys

Cho1, Zhang, Zunger

  • 1National Renewable Energy Laboratory, Golden, Colorado 80401, USA.

Physical Review Letters
|October 6, 2000
PubMed
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Indium surface segregation in Indium Gallium Arsenide (InGaAs) alloys is driven by near-surface energetics, enhancing ordering. In-In pair correlations become anisotropic near the surface, explaining experimental observations.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Computational Chemistry

Background:

  • Indium Gallium Arsenide (InGaAs) alloys exhibit complex surface behavior.
  • Understanding In-In pair correlations and surface segregation is crucial for material properties.

Purpose of the Study:

  • Investigate In-In pair correlations and In surface segregation in InGaAs alloys.
  • Explain the mechanisms behind In segregation on InGaAs(001)-beta2(2x4) surfaces.
  • Clarify the relationship between surface segregation, site selectivity, and long-range ordering.

Main Methods:

  • First-principles total-energy calculations.
  • Calculation of single In atom substitution energy.
  • Analysis of In-In pair interaction energies near the surface.

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Main Results:

  • Near-surface energetics drive observed In segregation on InGaAs(001)-beta2(2x4) surfaces.
  • Indium surface segregation enhances In site selectivity and long-range ordering.
  • In-In pair correlations transition from isotropic in bulk to highly anisotropic near the (001) surface.
  • Oscillatory sign of [110] In-In interaction energies with distance from the surface.

Conclusions:

  • The study provides a first-principles explanation for In surface segregation in InGaAs.
  • Anisotropic In-In interactions near the surface are key to understanding experimental data.
  • Findings reconcile theoretical predictions with puzzling cross-sectional scanning tunneling microscopy (x-STM) results.