Acousto-optical phonon excitation in piezoelectric wurtzite slabs and crystal growth orientation effects

Lars Duggen, Morten Willatzen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents a theoretical investigation of phonon dispersion in piezoelectric slabs of hexagonal crystal symmetry (wurtzite). Specifically we solve the fully coupled dispersion relations in a GaN free standing quantum well by varying the crystal growth direction from the [001] axis to the [010] axis. Accounting for the Drude model in solving the fully-coupled dispersion relations, phonon modes will generate an additional phonon band, with a high local density of phonon states, close to the plasma frequency. As opposed to cubic crystals with isotropic permittivity, the location of this band varies with crystal orientation. We also find that the phonon mode dependence on the crystal orientation is more pronounced for small in-plane wavenumbers.
Original languageEnglish
Article number064001
JournalSemiconductor Science and Technology
Volume32
Issue number6
Number of pages8
ISSN0268-1242
DOIs
Publication statusPublished - 2017

Keywords

  • Piezoelectricity
  • Acousto-optic phonons
  • Wurtzite

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