Elastic Topological Insulator via the Valley Hall Effect with Distorted Hexagonal Holes변형된 육각 구멍을 갖고 있는 밸리 홀 효과에 의한 탄성파 위상절연체

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Topological insulators have been studied extensively owing to its distinguished characteristics, which generates the edge state in which wave can propagate without backscattering. This work proposes a phononic crystal with distorted hexagonal holes, as an elastic topological insulator for in-plane wave based on the analogues of valley hall effect. First, the existence of a nontrivial valley topological phase on the phononic crystal is revealed by Bloch wave functions, Bloch frequencies at the valley, and numerically calculated valley Chem numbers, respectively. Then, a topologically protected edge state is generated on the boundary of two phononic crystals with different topological phases. Its topological protection property is confirmed on the band diagram by a supercell method utilizing the revealed valley topological phases. Finally, the nature of the edge state, which is topologically protected against sharp angles, is observed directly through a full field simulation.
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Issue Date
2021-04
Language
Korean
Article Type
Article
Citation

TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A, v.45, no.4, pp.311 - 318

ISSN
1226-4873
DOI
10.3795/KSME-A.2021.45.4.311
URI
http://hdl.handle.net/10203/285860
Appears in Collection
ME-Journal Papers(저널논문)
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