Topological photonic alloy
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911910524354560 |
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| author | Qu, Tiantao Wang, Mudi Cheng, Xiaoyu Cui, Xiaohan Zhang, Ruo-Yang Zhang, Zhao-Qing Zhang, Lei Chen, Jun Chan, C. T. |
| author_facet | Qu, Tiantao Wang, Mudi Cheng, Xiaoyu Cui, Xiaohan Zhang, Ruo-Yang Zhang, Zhao-Qing Zhang, Lei Chen, Jun Chan, C. T. |
| contents | We present the new concept of photonic alloy as a non-periodic topological material. By mixing non-magnetized and magnetized rods in a non-periodic 2D photonic crystal configuration, we realized photonic alloys in the microwave regime. Our experimental findings reveal that the photonic alloy sustains non-reciprocal chiral edge states (CESs) even at very low concentration of magnetized rods. The non-trivial topology and the associated edge states of these non-periodic systems can be characterized by the winding of the reflection phase. Our results indicate that the threshold concentrations for the investigated system within the first non-trivial band gap to exhibit topological behavior approach zero in the thermodynamic limit for substitutional alloys, while the threshold remains non-zero for interstitial alloys. At low concentration, the system exhibits an inhomogeneous structure characterized by isolated patches of non-percolating magnetic domains that are spaced far apart within a topologically trivial photonic crystal. Surprisingly, the system manifests CESs despite a local breakdown of time-reversal symmetry rather than a global one. Photonic alloys represent a new category of disordered topological materials, offering exciting opportunities for exploring topological materials with adjustable gaps. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_05168 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological photonic alloy Qu, Tiantao Wang, Mudi Cheng, Xiaoyu Cui, Xiaohan Zhang, Ruo-Yang Zhang, Zhao-Qing Zhang, Lei Chen, Jun Chan, C. T. Mesoscale and Nanoscale Physics Optics We present the new concept of photonic alloy as a non-periodic topological material. By mixing non-magnetized and magnetized rods in a non-periodic 2D photonic crystal configuration, we realized photonic alloys in the microwave regime. Our experimental findings reveal that the photonic alloy sustains non-reciprocal chiral edge states (CESs) even at very low concentration of magnetized rods. The non-trivial topology and the associated edge states of these non-periodic systems can be characterized by the winding of the reflection phase. Our results indicate that the threshold concentrations for the investigated system within the first non-trivial band gap to exhibit topological behavior approach zero in the thermodynamic limit for substitutional alloys, while the threshold remains non-zero for interstitial alloys. At low concentration, the system exhibits an inhomogeneous structure characterized by isolated patches of non-percolating magnetic domains that are spaced far apart within a topologically trivial photonic crystal. Surprisingly, the system manifests CESs despite a local breakdown of time-reversal symmetry rather than a global one. Photonic alloys represent a new category of disordered topological materials, offering exciting opportunities for exploring topological materials with adjustable gaps. |
| title | Topological photonic alloy |
| topic | Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2406.05168 |