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

Oltulu, O.Simsek S.Mamedov, A. M.Özbay, Ekmel2018-04-122018-04-1220160015-0193http://hdl.handle.net/11693/36637ABSTRACT: 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.EnglishAcoustic band gapsPhononic crystalsTopological insulatorWave propagationAcoustic devicesAcousticsCrystal structureElectric insulatorsEnergy gapPhononsCylindrical rodFrequency rangesPlane wave expansion methodPolyvinylidene fluoridesTopological insulatorsTwo-Dimensional Phononic CrystalsAcoustic wave propagationTopological insulator based locally resonant phononic crystals: wave propagation and acoustic band gapsArticle10.1080/00150193.2016.11735071563-5112