Observation of Higher Order Nodal Line Semimetal in Phononic Crystals
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910295893475328 |
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| author | Ma, Qiyun Pu, Zhenhang Ye, Liping Lu, Jiuyang Huang, Xueqin Ke, Manzhu He, Hailong Deng, Weiyin Liu, Zhengyou |
| author_facet | Ma, Qiyun Pu, Zhenhang Ye, Liping Lu, Jiuyang Huang, Xueqin Ke, Manzhu He, Hailong Deng, Weiyin Liu, Zhengyou |
| contents | Higher-order topological insulators and semimetals, which generalize the conventional bulk-boundary correspondence, have attracted extensive research interest. Among them, higher-order Weyl semimetals feature two-fold linear crossing points in three-dimensional (3D) momentum space, 2D Fermi-arc surface states, and 1D hinge states. Higher-order nodal-point semimetals possessing Weyl points or Dirac points have been implemented. However, higher-order nodal-line or nodal-surface semimetals remain to be further explored in experiments in spite of many previous theoretical efforts. In this work, we realize a second-order nodal-line semimetal in 3D phononic crystals. The bulk nodal lines, 2D drumhead surface states guaranteed by Zak phases, and 1D flat hinge states attributed to kz-dependent quadrupole moments, are observed in simulations and experiments. Our findings of nondispersive surface and hinge states may promote applications in acoustic sensing and energy harvesting. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04502 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of Higher Order Nodal Line Semimetal in Phononic Crystals Ma, Qiyun Pu, Zhenhang Ye, Liping Lu, Jiuyang Huang, Xueqin Ke, Manzhu He, Hailong Deng, Weiyin Liu, Zhengyou Mesoscale and Nanoscale Physics Higher-order topological insulators and semimetals, which generalize the conventional bulk-boundary correspondence, have attracted extensive research interest. Among them, higher-order Weyl semimetals feature two-fold linear crossing points in three-dimensional (3D) momentum space, 2D Fermi-arc surface states, and 1D hinge states. Higher-order nodal-point semimetals possessing Weyl points or Dirac points have been implemented. However, higher-order nodal-line or nodal-surface semimetals remain to be further explored in experiments in spite of many previous theoretical efforts. In this work, we realize a second-order nodal-line semimetal in 3D phononic crystals. The bulk nodal lines, 2D drumhead surface states guaranteed by Zak phases, and 1D flat hinge states attributed to kz-dependent quadrupole moments, are observed in simulations and experiments. Our findings of nondispersive surface and hinge states may promote applications in acoustic sensing and energy harvesting. |
| title | Observation of Higher Order Nodal Line Semimetal in Phononic Crystals |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.04502 |