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Title: Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator
Authors: Xue, Haoran
Jia, Ding
Ge, Yong
Guan, Yi-Jun
Wang, Qiang
Yuan, Shou-Qi
Sun, Hong-Xiang
Chong, Yidong
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2021
Source: Xue, H., Jia, D., Ge, Y., Guan, Y., Wang, Q., Yuan, S., Sun, H., Chong, Y. & Zhang, B. (2021). Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator. Physical Review Letters, 127(21), 214301-.
Project: MOE2016-T3-1-006
Journal: Physical Review Letters
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.127.214301
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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