期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.214301
关键词
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资金
- Singapore Ministry of Education [MOE2016-T3-1-006, MOE2019-T2-2-085]
- National Natural Science Foundation of China [11774137, 12174159, 51779107]
- China Postdoctoral Science Foundation [2020M671351]
- State Key Laboratory of Acoustics, Chinese Academy of Science [SKLA202115]
The study reveals the helical modes induced by dislocations in three-dimensional topological insulators, and experimentally observes and numerically verifies these modes serving as robust waveguides in three-dimensional media.
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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