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Polarized Raman spectroscopy and X-ray diffuse scattering in InGaAs/GaAs(100) quantum-dot chains

  • V. V. Strelchuk
  • Yu. I. MazurEmail author
  • Zh. M. Wang
  • M. Schmidbauer
  • O. F. Kolomys
  • M. Ya. Valakh
  • M. O. Manasreh
  • G. J. Salamo
Article

Abstract

Using polarized Raman spectroscopy and high resolution X-ray diffraction we have investigated self-organized In0.45Ga0.55As quantum-dot chains in InGaAs/GaAs multilayer structures. It is shown that the formation of InGaAs QDs in InGaAs/GaAs multilayered structures is accompanied by a strong improvement in the uniformity of size and shapes of QDs as well as vertical alignment and lateral ordering. At mean densities, extended chains of QDs (up to 5 μm) appear along the \( [1\bar 10] \) direction; however, increased ordering of QDs along the [110] direction could be observed, too. For the first time, InGaAs dot-chains were investigated using polarized Raman scattering. Observation of optical phonons localized in InGaAs QDs and two-dimensional (2D) layers is demonstrated. An obvious anisotropy in the intensity of Raman modes was observed when the electric field vector of the exciting laser beam is parallel or perpendicular to the wire-like axis \( [1\bar 10] \) of dot-chains. This effect may be related to symmetry lowering effects and real anisotropic geometry of the QDs and 2D wetting layers.

Keywords

GaAs Raman Spectrum Phonon Line Reciprocal Lattice Point GaAs Matrix 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • V. V. Strelchuk
    • 1
    • 2
  • Yu. I. Mazur
    • 1
    Email author
  • Zh. M. Wang
    • 1
  • M. Schmidbauer
    • 3
  • O. F. Kolomys
    • 2
  • M. Ya. Valakh
    • 2
  • M. O. Manasreh
    • 4
  • G. J. Salamo
    • 1
  1. 1.Department of PhysicsUniversity of ArkansasFayettevilleUSA
  2. 2.Lashkaryov Institute of Semiconductor PhysicsNAS of UkraineKyivUkraine
  3. 3.Institut für KristallzüchtungBerlinGermany
  4. 4.Department of Electrical EngineeringUniversity of ArkansasFayettevilleUSA

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