拓扑绝缘体
拓扑(电路)
互易晶格
物理
位错
格子(音乐)
拓扑量子数
凝聚态物理
光学
量子力学
衍射
声学
数学
组合数学
作者
Haoran Xue,Ding Jia,Yong Ge,Yijun Guan,Qiang Wang,Shouqi Yuan,Hong-xiang Sun,Y. K. Chong,Baile Zhang
标识
DOI:10.1103/physrevlett.127.214301
摘要
The interplay between real-space topological lattice defects and the reciprocal-space topology of energy bands can give rise to novel phenomena, such as one-dimensional topological modes bound to screw dislocations in three-dimensional topological insulators. We obtain direct experimental observations of dislocation-induced helical modes in an acoustic analog of a weak three-dimensional topological insulator. The spatial distribution of the helical modes is found through spin-resolved field mapping, and verified numerically by tight-binding and finite-element calculations. These one-dimensional helical channels can serve as robust waveguides in three-dimensional media. Our experiment paves the way to studying novel physical modes and functionalities enabled by topological lattice defects in three-dimensional classical topological materials.
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