Topological insulator based locally resonant phononic crystals: wave propagation and acoustic band gaps
Date
2016
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Source Title
Ferroelectrics
Print ISSN
0015-0193
Electronic ISSN
1563-5112
Publisher
Taylor and Francis Inc.
Volume
499
Issue
1
Pages
123 - 129
Language
English
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Journal Title
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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.
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Keywords
Acoustic band gaps , Phononic crystals , Topological insulator , Wave propagation , Acoustic devices , Acoustics , Crystal structure , Electric insulators , Energy gap , Phonons , Cylindrical rod , Frequency ranges , Plane wave expansion method , Polyvinylidene fluorides , Topological insulators , Two-Dimensional Phononic Crystals , Acoustic wave propagation