Symmetry-enforced nodal chain phonons
Topological phonons in crystalline materials have been attracting great interest. Most cases studied so far are direct generalizations of the topological states from electronic systems. Here, we reveal a class of topological phonons - the symmetry-enforced nodal-chain phonons, which manifest the cha...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/10356/164342 |
| _version_ | 1811690395319402496 |
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| author | Zhu, Jiaojiao Wu, Weikang Zhao, Jianzhou Chen, Hao Zhang, Lifa Yang, Shengyuan A. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Zhu, Jiaojiao Wu, Weikang Zhao, Jianzhou Chen, Hao Zhang, Lifa Yang, Shengyuan A. |
| author_sort | Zhu, Jiaojiao |
| collection | NTU |
| description | Topological phonons in crystalline materials have been attracting great interest. Most cases studied so far are direct generalizations of the topological states from electronic systems. Here, we reveal a class of topological phonons - the symmetry-enforced nodal-chain phonons, which manifest the characteristic of phononic systems. We show that in five space groups with D2d little co-group at a non-time-reversal-invariant-momentum point, the phononic nodal chain is guaranteed to exist owing to the vector basis symmetry of phonons, which is a character distinct from electronic and other systems. In other words, this symmetry enforcement feature of the proposed nodal chain is limited to phononic systems. Interestingly, the chains in these five space groups exhibit two different patterns: for tetragonal systems, they are one-dimensional along the fourfold axis; for cubic systems, they form a three-dimensional network structure. Based on first-principles calculations, we identify K2O as a realistic material hosting the proposed nodal-chain phonons. We show that the effect of LO-TO splitting helps to expose the nodal-chain phonons in a large frequency window. In addition, the nodal chains may lead to drumhead surface phonon modes on multiple surfaces of a sample. |
| first_indexed | 2024-10-01T06:03:19Z |
| format | Journal Article |
| id | ntu-10356/164342 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:03:19Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1643422023-02-28T20:09:29Z Symmetry-enforced nodal chain phonons Zhu, Jiaojiao Wu, Weikang Zhao, Jianzhou Chen, Hao Zhang, Lifa Yang, Shengyuan A. School of Physical and Mathematical Sciences Science::Physics Weyl Fermions Semimetal Topological phonons in crystalline materials have been attracting great interest. Most cases studied so far are direct generalizations of the topological states from electronic systems. Here, we reveal a class of topological phonons - the symmetry-enforced nodal-chain phonons, which manifest the characteristic of phononic systems. We show that in five space groups with D2d little co-group at a non-time-reversal-invariant-momentum point, the phononic nodal chain is guaranteed to exist owing to the vector basis symmetry of phonons, which is a character distinct from electronic and other systems. In other words, this symmetry enforcement feature of the proposed nodal chain is limited to phononic systems. Interestingly, the chains in these five space groups exhibit two different patterns: for tetragonal systems, they are one-dimensional along the fourfold axis; for cubic systems, they form a three-dimensional network structure. Based on first-principles calculations, we identify K2O as a realistic material hosting the proposed nodal-chain phonons. We show that the effect of LO-TO splitting helps to expose the nodal-chain phonons in a large frequency window. In addition, the nodal chains may lead to drumhead surface phonon modes on multiple surfaces of a sample. Ministry of Education (MOE) Published version This work were supported by Singapore Ministry of Education AcRF Tier 2 (MOE2019-T2-1-001) and the National Natural Science Foundation of China (No. 11604273). 2023-01-17T03:07:12Z 2023-01-17T03:07:12Z 2022 Journal Article Zhu, J., Wu, W., Zhao, J., Chen, H., Zhang, L. & Yang, S. A. (2022). Symmetry-enforced nodal chain phonons. Npj Quantum Materials, 7(1), 1-6. https://dx.doi.org/10.1038/s41535-022-00461-7 2397-4648 https://hdl.handle.net/10356/164342 10.1038/s41535-022-00461-7 2-s2.0-85129294348 1 7 1 6 en MOE2019-T2-1-001 npj Quantum Materials © The Author(s) 2022. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons. org/licenses/by/4.0/. application/pdf |
| spellingShingle | Science::Physics Weyl Fermions Semimetal Zhu, Jiaojiao Wu, Weikang Zhao, Jianzhou Chen, Hao Zhang, Lifa Yang, Shengyuan A. Symmetry-enforced nodal chain phonons |
| title | Symmetry-enforced nodal chain phonons |
| title_full | Symmetry-enforced nodal chain phonons |
| title_fullStr | Symmetry-enforced nodal chain phonons |
| title_full_unstemmed | Symmetry-enforced nodal chain phonons |
| title_short | Symmetry-enforced nodal chain phonons |
| title_sort | symmetry enforced nodal chain phonons |
| topic | Science::Physics Weyl Fermions Semimetal |
| url | https://hdl.handle.net/10356/164342 |
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