Topological valley transport under long-range deformations
Edge states protected by bulk topology of photonic crystals show robustness against short-range disorder, making robust information transfer possible. Here, topological photonic crystals under long-range deformations are investigated. The vertices of each regular hexagon in a honeycomb crystalline s...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-02-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.013209 |
| _version_ | 1797211566567849984 |
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| author | Zhixia Xu Xianghong Kong Robert J. Davis Dia'aaldin Bisharat Yun Zhou Xiaoxing Yin Daniel F. Sievenpiper |
| author_facet | Zhixia Xu Xianghong Kong Robert J. Davis Dia'aaldin Bisharat Yun Zhou Xiaoxing Yin Daniel F. Sievenpiper |
| author_sort | Zhixia Xu |
| collection | DOAJ |
| description | Edge states protected by bulk topology of photonic crystals show robustness against short-range disorder, making robust information transfer possible. Here, topological photonic crystals under long-range deformations are investigated. The vertices of each regular hexagon in a honeycomb crystalline structure are shifted randomly to establish a deformed system. By increasing the degree of random deformations, a transition from an ordered system to an amorphous system are investigated, where the close of the topological band gap is clearly shown. We further present comprehensive investigations into excitation methods of the proposed deformed system. Due to the lack of strict periodicity, excitation of topological edge modes becomes difficult. We discuss chiral and linearly polarized sources as two different methods respectively. It is found that chiral sources are sensitive and rely on the ordered lattice. Even a weak long-range deformation can bring fluctuations to transmission. We further designed and fabricated metal-dielectric-metal sandwichlike samples working in the microwave band. Using a linearly polarized source, we detected the existence of topological transport in the deformed system. This work investigates excitation and robustness of bulk topology against long-range deformations and may open the way for exploiting topological properties of materials with a deformed lattice. |
| first_indexed | 2024-04-24T10:28:32Z |
| format | Article |
| id | doaj.art-cfededd9f99c4aa1b35b32f20edeb773 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:28:32Z |
| publishDate | 2020-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-cfededd9f99c4aa1b35b32f20edeb7732024-04-12T16:50:26ZengAmerican Physical SocietyPhysical Review Research2643-15642020-02-012101320910.1103/PhysRevResearch.2.013209Topological valley transport under long-range deformationsZhixia XuXianghong KongRobert J. DavisDia'aaldin BisharatYun ZhouXiaoxing YinDaniel F. SievenpiperEdge states protected by bulk topology of photonic crystals show robustness against short-range disorder, making robust information transfer possible. Here, topological photonic crystals under long-range deformations are investigated. The vertices of each regular hexagon in a honeycomb crystalline structure are shifted randomly to establish a deformed system. By increasing the degree of random deformations, a transition from an ordered system to an amorphous system are investigated, where the close of the topological band gap is clearly shown. We further present comprehensive investigations into excitation methods of the proposed deformed system. Due to the lack of strict periodicity, excitation of topological edge modes becomes difficult. We discuss chiral and linearly polarized sources as two different methods respectively. It is found that chiral sources are sensitive and rely on the ordered lattice. Even a weak long-range deformation can bring fluctuations to transmission. We further designed and fabricated metal-dielectric-metal sandwichlike samples working in the microwave band. Using a linearly polarized source, we detected the existence of topological transport in the deformed system. This work investigates excitation and robustness of bulk topology against long-range deformations and may open the way for exploiting topological properties of materials with a deformed lattice.http://doi.org/10.1103/PhysRevResearch.2.013209 |
| spellingShingle | Zhixia Xu Xianghong Kong Robert J. Davis Dia'aaldin Bisharat Yun Zhou Xiaoxing Yin Daniel F. Sievenpiper Topological valley transport under long-range deformations Physical Review Research |
| title | Topological valley transport under long-range deformations |
| title_full | Topological valley transport under long-range deformations |
| title_fullStr | Topological valley transport under long-range deformations |
| title_full_unstemmed | Topological valley transport under long-range deformations |
| title_short | Topological valley transport under long-range deformations |
| title_sort | topological valley transport under long range deformations |
| url | http://doi.org/10.1103/PhysRevResearch.2.013209 |
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