Raman scattering of InAs/AlAs quantum dot superlattices grown on (001) and (311)B GaAs surfaces

Alexander Milekhin, Nikolay Yeryukov, Alexander Toropov, Dmitry Dmitriev, Evgeniya Sheremet, Dietrich R.T. Zahn

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6 Citations (Scopus)

Abstract

We present a comparative analysis of Raman scattering by acoustic and optical phonons in InAs/AlAs quantum dot superlattices grown on (001) and (311)B GaAs surfaces. Doublets of folded longitudinal acoustic phonons up to the fifth order were observed in the Raman spectra of (001)- and (311)B-oriented quantum dot superlattices measured in the polarized scattering geometries. The energy positions of the folded acoustic phonons are well described by the elastic continuum model. Besides the acoustic phonons, the spectra display features related to confined transverse and longitudinal optical as well as interface phonons in quantum dots and spacer layers. Their frequency positions are discussed in terms of phonon confinement, elastic stress, and atomic intermixing.

Original languageEnglish
Article number476
JournalNanoscale Research Letters
Volume7
DOIs
Publication statusPublished - 17 Sep 2012
Externally publishedYes

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Keywords

  • Nanocrystals
  • Nanoparticles
  • Phonons
  • Quantum dots
  • Raman scattering spectroscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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