Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles
Abstract Topology plays a crucial role in many physical systems, leading to interesting states at the surface. A paradigmatic example is the Chern number defined in the Brillouin zone that leads to robust gapless edge states. Here we introduce the reduced Chern number, defined in the subregions of B...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-01-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-023-01502-8 |
| _version_ | 1797349845529264128 |
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| author | Yun-Chung Chen Yu-Ping Lin Ying-Jer Kao |
| author_facet | Yun-Chung Chen Yu-Ping Lin Ying-Jer Kao |
| author_sort | Yun-Chung Chen |
| collection | DOAJ |
| description | Abstract Topology plays a crucial role in many physical systems, leading to interesting states at the surface. A paradigmatic example is the Chern number defined in the Brillouin zone that leads to robust gapless edge states. Here we introduce the reduced Chern number, defined in the subregions of Brillouin zone, and construct a family of Chern dartboard insulators with quantized reduced Chern numbers but with trivial bulk topology. Chern dartboard insulators are protected by the mirror symmetries and exhibit distinct pseudospin textures, including (anti)skyrmions, inside the sub-Brillouin zone. These Chern dartboard insulators host exotic gapless edge states, such as Möbius fermions and midgap corner states, and can be realized in the photonic crystals. Our work opens up new possibilities for exploring sub-Brillouin zone topology and nontrivial surface responses in topological systems. |
| first_indexed | 2024-03-08T12:37:22Z |
| format | Article |
| id | doaj.art-4b1da38f99014c269d9a3221f63318ef |
| institution | Directory Open Access Journal |
| issn | 2399-3650 |
| language | English |
| last_indexed | 2024-03-08T12:37:22Z |
| publishDate | 2024-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj.art-4b1da38f99014c269d9a3221f63318ef2024-01-21T12:24:16ZengNature PortfolioCommunications Physics2399-36502024-01-01711810.1038/s42005-023-01502-8Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipolesYun-Chung Chen0Yu-Ping Lin1Ying-Jer Kao2Department of Physics and Center for Theoretical Physics, National Taiwan UniversityDepartment of Physics, University of CaliforniaDepartment of Physics and Center for Theoretical Physics, National Taiwan UniversityAbstract Topology plays a crucial role in many physical systems, leading to interesting states at the surface. A paradigmatic example is the Chern number defined in the Brillouin zone that leads to robust gapless edge states. Here we introduce the reduced Chern number, defined in the subregions of Brillouin zone, and construct a family of Chern dartboard insulators with quantized reduced Chern numbers but with trivial bulk topology. Chern dartboard insulators are protected by the mirror symmetries and exhibit distinct pseudospin textures, including (anti)skyrmions, inside the sub-Brillouin zone. These Chern dartboard insulators host exotic gapless edge states, such as Möbius fermions and midgap corner states, and can be realized in the photonic crystals. Our work opens up new possibilities for exploring sub-Brillouin zone topology and nontrivial surface responses in topological systems.https://doi.org/10.1038/s42005-023-01502-8 |
| spellingShingle | Yun-Chung Chen Yu-Ping Lin Ying-Jer Kao Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles Communications Physics |
| title | Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles |
| title_full | Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles |
| title_fullStr | Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles |
| title_full_unstemmed | Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles |
| title_short | Chern dartboard insulator: sub-Brillouin zone topology and skyrmion multipoles |
| title_sort | chern dartboard insulator sub brillouin zone topology and skyrmion multipoles |
| url | https://doi.org/10.1038/s42005-023-01502-8 |
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