Experimental Observation of Non-Abelian Earring Nodal Links in Phononic Crystals

Mudi Wang; Shan Liu; Qiyun Ma; Ruo Yang Zhang; Dongyang Wang; Qinghua Guo; Biao Yang; Manzhu Ke; Zhengyou Liu; C. T. Chan

doi:10.1103/physrevlett.128.246601

Experimental Observation of Non-Abelian Earring Nodal Links in Phononic Crystals

Mudi Wang, Shan Liu, Qiyun Ma, Ruo Yang Zhang, Dongyang Wang, Qinghua Guo, Biao Yang, Manzhu Ke, Zhengyou Liu, C. T. Chan

Research output: Contribution to journal › Article › peer-review

24 Citations (SciVal)

Abstract

Nodal lines are symmetry-protected one-dimensional band degeneracies in momentum space, which can appear in numerous topological configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian topological physics have been proposed in space-time inversion (PT) symmetric systems. One of the most special configurations in such systems is the earring nodal link, composing of a nodal chain linking with an isolated nodal line. Such earring nodal links have not been observed in real systems. We designed phononic crystals with earring nodal links, and experimentally observed two different kinds of earring nodal links by measuring the band structures. We found that the order of the nodal chain and line can be switched after band inversion but their link cannot be severed. Our Letter provides experimental evidence for phenomena unique to non-Abelian band topology and our acoustic system provides a convenient platform for studying the new materials carrying non-Abelian charges.

Original language	English (US)
Journal	Physical Review Letters
Volume	128
Issue number	24
DOIs	https://doi.org/10.1103/physrevlett.128.246601
State	Published - Jun 14 2022
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/physrevlett.128.246601

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@article{fdba0f911b26405692dca7571314320c,

title = "Experimental Observation of Non-Abelian Earring Nodal Links in Phononic Crystals",

abstract = "Nodal lines are symmetry-protected one-dimensional band degeneracies in momentum space, which can appear in numerous topological configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian topological physics have been proposed in space-time inversion (PT) symmetric systems. One of the most special configurations in such systems is the earring nodal link, composing of a nodal chain linking with an isolated nodal line. Such earring nodal links have not been observed in real systems. We designed phononic crystals with earring nodal links, and experimentally observed two different kinds of earring nodal links by measuring the band structures. We found that the order of the nodal chain and line can be switched after band inversion but their link cannot be severed. Our Letter provides experimental evidence for phenomena unique to non-Abelian band topology and our acoustic system provides a convenient platform for studying the new materials carrying non-Abelian charges.",

author = "Mudi Wang and Shan Liu and Qiyun Ma and Zhang, {Ruo Yang} and Dongyang Wang and Qinghua Guo and Biao Yang and Manzhu Ke and Zhengyou Liu and Chan, {C. T.}",

note = "KAUST Repository Item: Exported on 2022-06-17 Acknowledged KAUST grant number(s): KAUST20SC01 Acknowledgements: This work is supported by Hong Kong RGC Grant No. AoE/P-502/20, Grant No. 16307821, KAUST CRG grant (KAUST20SC01), the Croucher foundation (CAS20SC01), the National Key R&D Program of China (Grant No. 2018YFA0305800), and the National Natural Science Foundation of China (Grants No. 11890701, No. 11774275 and No. 11974262). This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2022",

month = jun,

day = "14",

doi = "10.1103/physrevlett.128.246601",

language = "English (US)",

volume = "128",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "24",

}

TY - JOUR

T1 - Experimental Observation of Non-Abelian Earring Nodal Links in Phononic Crystals

AU - Wang, Mudi

AU - Liu, Shan

AU - Ma, Qiyun

AU - Zhang, Ruo Yang

AU - Wang, Dongyang

AU - Guo, Qinghua

AU - Yang, Biao

AU - Ke, Manzhu

AU - Liu, Zhengyou

AU - Chan, C. T.

N1 - KAUST Repository Item: Exported on 2022-06-17 Acknowledged KAUST grant number(s): KAUST20SC01 Acknowledgements: This work is supported by Hong Kong RGC Grant No. AoE/P-502/20, Grant No. 16307821, KAUST CRG grant (KAUST20SC01), the Croucher foundation (CAS20SC01), the National Key R&D Program of China (Grant No. 2018YFA0305800), and the National Natural Science Foundation of China (Grants No. 11890701, No. 11774275 and No. 11974262). This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2022/6/14

Y1 - 2022/6/14

N2 - Nodal lines are symmetry-protected one-dimensional band degeneracies in momentum space, which can appear in numerous topological configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian topological physics have been proposed in space-time inversion (PT) symmetric systems. One of the most special configurations in such systems is the earring nodal link, composing of a nodal chain linking with an isolated nodal line. Such earring nodal links have not been observed in real systems. We designed phononic crystals with earring nodal links, and experimentally observed two different kinds of earring nodal links by measuring the band structures. We found that the order of the nodal chain and line can be switched after band inversion but their link cannot be severed. Our Letter provides experimental evidence for phenomena unique to non-Abelian band topology and our acoustic system provides a convenient platform for studying the new materials carrying non-Abelian charges.

AB - Nodal lines are symmetry-protected one-dimensional band degeneracies in momentum space, which can appear in numerous topological configurations such as nodal rings, chains, links, and knots. Very recently, non-Abelian topological physics have been proposed in space-time inversion (PT) symmetric systems. One of the most special configurations in such systems is the earring nodal link, composing of a nodal chain linking with an isolated nodal line. Such earring nodal links have not been observed in real systems. We designed phononic crystals with earring nodal links, and experimentally observed two different kinds of earring nodal links by measuring the band structures. We found that the order of the nodal chain and line can be switched after band inversion but their link cannot be severed. Our Letter provides experimental evidence for phenomena unique to non-Abelian band topology and our acoustic system provides a convenient platform for studying the new materials carrying non-Abelian charges.

UR - http://hdl.handle.net/10754/669713

UR - https://link.aps.org/doi/10.1103/PhysRevLett.128.246601

U2 - 10.1103/physrevlett.128.246601

DO - 10.1103/physrevlett.128.246601

M3 - Article

SN - 0031-9007

VL - 128

JO - Physical Review Letters

JF - Physical Review Letters

IS - 24

ER -

Experimental Observation of Non-Abelian Earring Nodal Links in Phononic Crystals

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