Robust boundary-induced bulk propagations in elastic waveguides with nonplanar surfaces  

作　　者：Baizhan Xia Jielong Zhang Zihan Jiang Jianting Liu 

机构地区：[1]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China [2]College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第4期88-96,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12072108);the Natural Science Foundation of Hunan Province for Distinguished Young Scholars(Grant No.2022JJ10003)。

摘　　要：Trivial elastic waveguides induced by line defects and nontrivial elastic waveguides protected by topological edge states have been extensively examined in planar waveguide systems.Despite these investigations,little is known about topologically protected bulk states and their resulting robust transmission properties,especially in nonplanar elastic waveguides with folded,curved,and twisted surfaces.Elastic Dirac waveguides with robust boundary-induced bulk states are presented.These states arise from the truncated boundaries of bulks with linear Dirac conical dispersions,differing from topologically protected edge states ensured by the bulk-edge correspondence.Experimental proof is provided,in which boundary-induced bulk states show robustly high-throughput transmissions along the waveguides,even with folded,curved,and twisted surfaces.These results not only open up new avenues for examining novel topological phenomena about bulk but also offer new platforms for developing topological devices with nonplanar surfaces.

关 键 词：elastic waveguides boundary-induced bulk propagations Dirac conical dispersions nonplanar surfaces 

分 类 号：O347.41[理学—固体力学]