Terahertz acoustic wave on piezoelectric semiconductor film via large-scale molecular dynamics simulation

Ryo Hikata, Kenji Tsuruta, Atsushi Ishikawa, Kazuhiro Fujimori

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

By atomistic simulation, we investigate an acoustic wave at THz frequencies in nanoscale thin films of aluminum-nitride piezoelectric material. A mode analysis reveals that the thickness longitudinal mode along the [0001] direction exists stably at the atomic level. To control the acoustic wave, we introduce a phononic crystal (PC) structure in the films. We determine the band-gap frequency in the phonon dispersion of the PC structure and confirm via molecular dynamics simulation that the acoustic wave within the band-gap frequency can be confined by a waveguide structure with a PC. The possibility of designing and controlling a THz acoustic wave in a nanoscale thin film with a PC is thereby demonstrated.

Original languageEnglish
Article number07HB07
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume54
Issue number7
DOIs
Publication statusPublished - Jul 1 2015

Fingerprint

Terahertz waves
Molecular dynamics
Acoustic waves
Semiconductor materials
molecular dynamics
acoustics
Computer simulation
Energy gap
simulation
Crystal structure
Thin films
Crystals
crystal structure
Aluminum nitride
Piezoelectric materials
aluminum nitrides
thin films
crystals
Waveguides
waveguides

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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