Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods

We report the experimental and numerical realization of a pseudospin-dependent acoustic topological insulator based on two sonic crystals constructed by the same regular hexagonal rods. Based on the zone folding mechanism, we obtain double Dirac cones with a four-fold deterministic degeneracy in the...

Full description

Bibliographic Details
Main Authors:	Ding Jia, Shuai Gu, Shuai Jiang, Yong Ge, Shou-qi Yuan, Hong-xiang Sun
Format:	Article
Language:	English
Published:	Frontiers Media S.A. 2021-09-01
Series:	Frontiers in Physics
Subjects:	sonic crystal acoustic topological insulator pseudospin dirac cone acoustics
Online Access:	https://www.frontiersin.org/articles/10.3389/fphy.2021.762567/full

id	doaj-3fd31f9f87554478910499e8634fa69d
record_format	Article
spelling	doaj-3fd31f9f87554478910499e8634fa69d2021-09-28T06:49:04ZengFrontiers Media S.A.Frontiers in Physics2296-424X2021-09-01910.3389/fphy.2021.762567762567Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal RodsDing Jia0Ding Jia1Shuai Gu2Shuai Jiang3Yong Ge4Shou-qi Yuan5Hong-xiang Sun6Hong-xiang Sun7Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaSchool of Computer Science and Communications Engineering, Jiangsu University, Zhenjiang, ChinaResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaResearch Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, ChinaState Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, ChinaWe report the experimental and numerical realization of a pseudospin-dependent acoustic topological insulator based on two sonic crystals constructed by the same regular hexagonal rods. Based on the zone folding mechanism, we obtain double Dirac cones with a four-fold deterministic degeneracy in the sonic crystal, and realize a band inversion and topological phase transition by rotating the rods. We observe the topologically protected one-way sound propagation of pseudospin-dependent edge states in a designed topological insulator composed of two selected sonic crystals with different rotation angles of the rods. Furthermore, we experimentally demonstrate the robustness of topological sound propagation against two types of defects, in which the edge states are almost immune to backscattering, and remain pseudospin-dependent characteristics. Our work provides a diverse route for designing tunable topological functional sound devices.https://www.frontiersin.org/articles/10.3389/fphy.2021.762567/fullsonic crystalacoustic topological insulatorpseudospindirac coneacoustics
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Ding Jia Ding Jia Shuai Gu Shuai Jiang Yong Ge Shou-qi Yuan Hong-xiang Sun Hong-xiang Sun
spellingShingle	Ding Jia Ding Jia Shuai Gu Shuai Jiang Yong Ge Shou-qi Yuan Hong-xiang Sun Hong-xiang Sun Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods Frontiers in Physics sonic crystal acoustic topological insulator pseudospin dirac cone acoustics
author_facet	Ding Jia Ding Jia Shuai Gu Shuai Jiang Yong Ge Shou-qi Yuan Hong-xiang Sun Hong-xiang Sun
author_sort	Ding Jia
title	Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods
title_short	Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods
title_full	Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods
title_fullStr	Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods
title_full_unstemmed	Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods
title_sort	pseudospin-dependent acoustic topological insulator by sonic crystals with same hexagonal rods
publisher	Frontiers Media S.A.
series	Frontiers in Physics
issn	2296-424X
publishDate	2021-09-01
description	We report the experimental and numerical realization of a pseudospin-dependent acoustic topological insulator based on two sonic crystals constructed by the same regular hexagonal rods. Based on the zone folding mechanism, we obtain double Dirac cones with a four-fold deterministic degeneracy in the sonic crystal, and realize a band inversion and topological phase transition by rotating the rods. We observe the topologically protected one-way sound propagation of pseudospin-dependent edge states in a designed topological insulator composed of two selected sonic crystals with different rotation angles of the rods. Furthermore, we experimentally demonstrate the robustness of topological sound propagation against two types of defects, in which the edge states are almost immune to backscattering, and remain pseudospin-dependent characteristics. Our work provides a diverse route for designing tunable topological functional sound devices.
topic	sonic crystal acoustic topological insulator pseudospin dirac cone acoustics
url	https://www.frontiersin.org/articles/10.3389/fphy.2021.762567/full
work_keys_str_mv	AT dingjia pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT dingjia pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT shuaigu pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT shuaijiang pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT yongge pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT shouqiyuan pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT hongxiangsun pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods AT hongxiangsun pseudospindependentacoustictopologicalinsulatorbysoniccrystalswithsamehexagonalrods
_version_	1716866320895574016

Pseudospin-dependent Acoustic Topological Insulator by Sonic Crystals With Same Hexagonal Rods

Similar Items