Observation of Dirac hierarchy in three-dimensional acoustic topological insulators
Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless electrons in graphene to robust surface states in topological insulators (TIs). Recent studies have theoretically revealed a full Dirac hierarchy comprising an eightfold bulk DC, a fourfold surface DC, and a twof...
Saved in:
Main Authors: | , , , , , , , , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/170754 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-170754 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-1707542023-10-09T15:35:02Z Observation of Dirac hierarchy in three-dimensional acoustic topological insulators Yang, Linyun Wang, Yin Meng, Yan Zhu, Zhenxiao Xi, Xiang Yan, Bei Lin, Shuxin Chen, Jingming Shi, Bin-Jie Ge, Yong Yuan, Shou-Qi Chen, Hongsheng Sun, Hong-Xiang Liu, Gui-Geng Yang, Yihao Gao, Zhen School of Physical and Mathematical Sciences Science::Physics Electric Insulators Acoustic Measurements Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless electrons in graphene to robust surface states in topological insulators (TIs). Recent studies have theoretically revealed a full Dirac hierarchy comprising an eightfold bulk DC, a fourfold surface DC, and a twofold hinge DC, associated with a hierarchy of topological phases including first-order to third-order three-dimensional (3D) topological insulators, using the same 3D base lattice. Here, we report the first experimental observation of the Dirac hierarchy in 3D acoustic TIs. Using acoustic measurements, we unambiguously reveal that lifting of multifold DCs in each hierarchy can induce two-dimensional topological surface states with a fourfold DC in a first-order 3D TI, one-dimensional topological hinge states with a twofold DC in a second-order 3D TI, and zero-dimensional topological corner states in a third-order 3D TI. Our Letter not only expands the fundamental research scope of Dirac physics, but also opens up a new route for multidimensional robust wave manipulation. Published version This work was sponsored by the National Natural Science Foundation of China under Grant No. 12104211, and the Southern University of Science and Technology for SUSTECH Start-up Grant (Y01236148, Y01236248). The work at Zhejiang University was sponsored by the National Natural Science Foundation of China under Grant No. 62175215, the Fundamental Research Funds for the Central Universities (2021FZZX001-19), and the Excellent Young Scientists Fund Program (Overseas) of China. H. S. acknowledged the support of the National Key Research and Development Program of China (Grant No. 2020YFC1512403), and the National Natural Science Foundation of China (Grant No. 12174159 and No. 12274183). 2023-10-06T06:15:36Z 2023-10-06T06:15:36Z 2022 Journal Article Yang, L., Wang, Y., Meng, Y., Zhu, Z., Xi, X., Yan, B., Lin, S., Chen, J., Shi, B., Ge, Y., Yuan, S., Chen, H., Sun, H., Liu, G., Yang, Y. & Gao, Z. (2022). Observation of Dirac hierarchy in three-dimensional acoustic topological insulators. Physical Review Letters, 129(12), 125502-. https://dx.doi.org/10.1103/PhysRevLett.129.125502 0031-9007 https://hdl.handle.net/10356/170754 10.1103/PhysRevLett.129.125502 36179186 2-s2.0-85138951864 12 129 125502 en Physical Review Letters © 2022 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at 10.1103/PhysRevLett.129.125502 application/pdf |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
Science::Physics Electric Insulators Acoustic Measurements |
spellingShingle |
Science::Physics Electric Insulators Acoustic Measurements Yang, Linyun Wang, Yin Meng, Yan Zhu, Zhenxiao Xi, Xiang Yan, Bei Lin, Shuxin Chen, Jingming Shi, Bin-Jie Ge, Yong Yuan, Shou-Qi Chen, Hongsheng Sun, Hong-Xiang Liu, Gui-Geng Yang, Yihao Gao, Zhen Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
description |
Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless electrons in graphene to robust surface states in topological insulators (TIs). Recent studies have theoretically revealed a full Dirac hierarchy comprising an eightfold bulk DC, a fourfold surface DC, and a twofold hinge DC, associated with a hierarchy of topological phases including first-order to third-order three-dimensional (3D) topological insulators, using the same 3D base lattice. Here, we report the first experimental observation of the Dirac hierarchy in 3D acoustic TIs. Using acoustic measurements, we unambiguously reveal that lifting of multifold DCs in each hierarchy can induce two-dimensional topological surface states with a fourfold DC in a first-order 3D TI, one-dimensional topological hinge states with a twofold DC in a second-order 3D TI, and zero-dimensional topological corner states in a third-order 3D TI. Our Letter not only expands the fundamental research scope of Dirac physics, but also opens up a new route for multidimensional robust wave manipulation. |
author2 |
School of Physical and Mathematical Sciences |
author_facet |
School of Physical and Mathematical Sciences Yang, Linyun Wang, Yin Meng, Yan Zhu, Zhenxiao Xi, Xiang Yan, Bei Lin, Shuxin Chen, Jingming Shi, Bin-Jie Ge, Yong Yuan, Shou-Qi Chen, Hongsheng Sun, Hong-Xiang Liu, Gui-Geng Yang, Yihao Gao, Zhen |
format |
Article |
author |
Yang, Linyun Wang, Yin Meng, Yan Zhu, Zhenxiao Xi, Xiang Yan, Bei Lin, Shuxin Chen, Jingming Shi, Bin-Jie Ge, Yong Yuan, Shou-Qi Chen, Hongsheng Sun, Hong-Xiang Liu, Gui-Geng Yang, Yihao Gao, Zhen |
author_sort |
Yang, Linyun |
title |
Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
title_short |
Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
title_full |
Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
title_fullStr |
Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
title_full_unstemmed |
Observation of Dirac hierarchy in three-dimensional acoustic topological insulators |
title_sort |
observation of dirac hierarchy in three-dimensional acoustic topological insulators |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/170754 |
_version_ |
1781793775639592960 |