Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system
Being a research hotspot in the field of topological semimetals, Weyl points (WPs) are monopoles of Berry curvature in momentum space. In this paper, we report the existence of photonic Weyl degeneracies in a reciprocal chiral metamaterials system. Due to the flat dispersion relation of the bulk pla...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2021-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ac254f |
| _version_ | 1797750094007631872 |
|---|---|
| author | Mingzhu Li Jie Song Yongyuan Jiang |
| author_facet | Mingzhu Li Jie Song Yongyuan Jiang |
| author_sort | Mingzhu Li |
| collection | DOAJ |
| description | Being a research hotspot in the field of topological semimetals, Weyl points (WPs) are monopoles of Berry curvature in momentum space. In this paper, we report the existence of photonic Weyl degeneracies in a reciprocal chiral metamaterials system. Due to the flat dispersion relation of the bulk plasmon modes, Weyl degeneracies here lie right on the critical transition between the type-I and type-II WPs. The photonic ‘Fermi arc’ connects the projection of pairs of WPs at the interface between the metamaterials and vacuum. Despite the bulk equi-frequency surfaces have changed dramatically, the ‘Fermi arc’ always exists. In addition, numerical simulations of topologically protected ‘Fermi arc’ surface states show that the surface waves are not scattered or reflected by the presence of sharp corners. Notably, such metamaterials host either type-I, type-II WPs or triple degenerate points (TDPs) depending on the nonlocal response. Our work provides an ideal photonic platform for studying the closely relation between WPs and other exotic states. |
| first_indexed | 2024-03-12T16:28:42Z |
| format | Article |
| id | doaj.art-a679e17b72be43d3bfc4a9f3e9e39f87 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:28:42Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-a679e17b72be43d3bfc4a9f3e9e39f872023-08-08T15:37:12ZengIOP PublishingNew Journal of Physics1367-26302021-01-0123909303610.1088/1367-2630/ac254fTopological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials systemMingzhu Li0Jie Song1Yongyuan Jiang2School of Physics, Harbin Institute of Technology , Harbin, 150001, People’s Republic of ChinaSchool of Physics, Harbin Institute of Technology , Harbin, 150001, People’s Republic of ChinaSchool of Physics, Harbin Institute of Technology , Harbin, 150001, People’s Republic of China; Collaborative Innovation Center of Extreme Optics, Shanxi University , Taiyuan 030006, People’s Republic of China; Key Lab of Micro-Optics and Photonic Technology of Heilongjiang Province , Harbin 150001, People’s Republic of China; Key Lab of Micro-Nano Optoelectronic Information System, Ministry of Industry and Information Technology , Harbin 150001, People’s Republic of ChinaBeing a research hotspot in the field of topological semimetals, Weyl points (WPs) are monopoles of Berry curvature in momentum space. In this paper, we report the existence of photonic Weyl degeneracies in a reciprocal chiral metamaterials system. Due to the flat dispersion relation of the bulk plasmon modes, Weyl degeneracies here lie right on the critical transition between the type-I and type-II WPs. The photonic ‘Fermi arc’ connects the projection of pairs of WPs at the interface between the metamaterials and vacuum. Despite the bulk equi-frequency surfaces have changed dramatically, the ‘Fermi arc’ always exists. In addition, numerical simulations of topologically protected ‘Fermi arc’ surface states show that the surface waves are not scattered or reflected by the presence of sharp corners. Notably, such metamaterials host either type-I, type-II WPs or triple degenerate points (TDPs) depending on the nonlocal response. Our work provides an ideal photonic platform for studying the closely relation between WPs and other exotic states.https://doi.org/10.1088/1367-2630/ac254ftopological semimetals‘Fermi arc’band structure |
| spellingShingle | Mingzhu Li Jie Song Yongyuan Jiang Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system New Journal of Physics topological semimetals ‘Fermi arc’ band structure |
| title | Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system |
| title_full | Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system |
| title_fullStr | Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system |
| title_full_unstemmed | Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system |
| title_short | Topological characteristic of Weyl degeneracies in a reciprocal chiral metamaterials system |
| title_sort | topological characteristic of weyl degeneracies in a reciprocal chiral metamaterials system |
| topic | topological semimetals ‘Fermi arc’ band structure |
| url | https://doi.org/10.1088/1367-2630/ac254f |
| work_keys_str_mv | AT mingzhuli topologicalcharacteristicofweyldegeneraciesinareciprocalchiralmetamaterialssystem AT jiesong topologicalcharacteristicofweyldegeneraciesinareciprocalchiralmetamaterialssystem AT yongyuanjiang topologicalcharacteristicofweyldegeneraciesinareciprocalchiralmetamaterialssystem |