Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators
|Joint first author||Yang，Linyun; Wang，Yin|
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.
NI Journal Papers
First ; Corresponding
National Natural Science Foundation of China[
|WOS Research Area|
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:4
|Document Type||Journal Article|
|Department||Department of Electrical and Electronic Engineering|
1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Research Center of Fluid Machinery Engineering and Technology,School of Physics and Electronics Engineering,Jiangsu University,Zhenjiang,212013,China
3.State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100190,China
4.Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore,21 Nanyang Link,637371,Singapore
5.Interdisciplinary Center for Quantum Information,State Key Laboratory of Modern Optical Instrumentation,College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou,310027,China
6.ZJU-Hangzhou Global Science and Technology Innovation Center,Key Laboratory of Advanced Micro,Nano Electronic Devices and Smart Systems of Zhejiang,ZJU-UIUC Institute,Zhejiang University,Hangzhou,310027,China
|First Author Affilication||Department of Electrical and Electronic Engineering|
|Corresponding Author Affilication||Department of Electrical and Electronic Engineering|
|First Author's First Affilication||Department of Electrical and Electronic Engineering|
Yang，Linyun,Wang，Yin,Meng，Yan,et al. Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators[J]. PHYSICAL REVIEW LETTERS,2022,129(12).
Yang，Linyun.,Wang，Yin.,Meng，Yan.,Zhu，Zhenxiao.,Xi，Xiang.,...&Gao，Zhen.(2022).Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators.PHYSICAL REVIEW LETTERS,129(12).
Yang，Linyun,et al."Observation of Dirac Hierarchy in Three-Dimensional Acoustic Topological Insulators".PHYSICAL REVIEW LETTERS 129.12(2022).
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