Topological insulator based locally resonant phononic crystals: Wave propagation and acoustic band gaps

Oltulu O., ŞİMŞEK Ş., Mamedov A. M., Ozbay E.

Ferroelectrics, vol.499, no.1, pp.123-129, 2016 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 499 Issue: 1
  • Publication Date: 2016
  • Doi Number: 10.1080/00150193.2016.1173507
  • Journal Name: Ferroelectrics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.123-129
  • Keywords: acoustic band gaps, Phononic crystals, topological insulator, wave propagation
  • Hakkari University Affiliated: Yes

Abstract

ABSTRACT: In the present work the acoustic band structure of a two-dimensional phononic crystal (PC) containing an organic ferroelectric (PVDF- polyvinylidene fluoride) and topological insulator (Bi2Te3) were investigated by the plane-wave-expansion (PWE) method. Two-dimensional PC with square lattices composed of Bi2Te3 cylindrical rods embedded in the PVDF matrix are studied to find the existence of stop bands for the waves of certain energy. Phononic band diagram ω = ω(k) for a 2D PC along the Г-X-M-Г path in the square Brillouin zone show four stop bands in the frequency range 0.01–8.0 kHz.