Robust edge states in amorphous gyromagnetic photonic lattices
We numerically study amorphous analogs of a two-dimensional photonic Chern insulator. The amorphous lattices consist of gyromagnetic rods that break time-reversal symmetry, with the lattice sites generated by a close-packing algorithm. The level of short-range order is adjustable, and there is no lo...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2018
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| Online Access: | https://hdl.handle.net/10356/87483 http://hdl.handle.net/10220/46733 |
| _version_ | 1826118833818042368 |
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| author | Mansha, Shampy Chong, Yi Dong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Mansha, Shampy Chong, Yi Dong |
| author_sort | Mansha, Shampy |
| collection | NTU |
| description | We numerically study amorphous analogs of a two-dimensional photonic Chern insulator. The amorphous lattices consist of gyromagnetic rods that break time-reversal symmetry, with the lattice sites generated by a close-packing algorithm. The level of short-range order is adjustable, and there is no long-range order. The topologically nontrivial gaps of the photonic Chern insulator are found to persist into the amorphous regime, so long as there is sufficient short-range order. Strongly nonreciprocal robust transmission occurs via edge states, which are shown to propagate ballistically despite the absence of long-range order, and to be exponentially localized along the lattice edge. Interestingly, there is an enhancement of nonreciprocal transmission even at very low levels of short-range order, where there are no discernible spectral gaps. |
| first_indexed | 2024-10-01T04:49:59Z |
| format | Journal Article |
| id | ntu-10356/87483 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:49:59Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/874832023-02-28T19:34:13Z Robust edge states in amorphous gyromagnetic photonic lattices Mansha, Shampy Chong, Yi Dong School of Physical and Mathematical Sciences DRNTU::Science::Physics Topological Phases of Matter Topological Effects in Photonic Systems We numerically study amorphous analogs of a two-dimensional photonic Chern insulator. The amorphous lattices consist of gyromagnetic rods that break time-reversal symmetry, with the lattice sites generated by a close-packing algorithm. The level of short-range order is adjustable, and there is no long-range order. The topologically nontrivial gaps of the photonic Chern insulator are found to persist into the amorphous regime, so long as there is sufficient short-range order. Strongly nonreciprocal robust transmission occurs via edge states, which are shown to propagate ballistically despite the absence of long-range order, and to be exponentially localized along the lattice edge. Interestingly, there is an enhancement of nonreciprocal transmission even at very low levels of short-range order, where there are no discernible spectral gaps. MOE (Min. of Education, S’pore) Published version 2018-11-29T06:05:49Z 2019-12-06T16:42:51Z 2018-11-29T06:05:49Z 2019-12-06T16:42:51Z 2017 Journal Article Mansha, S., & Chong, Y. D. (2017). Robust edge states in amorphous gyromagnetic photonic lattices. Physical Review B, 96(12), 121405-. doi:10.1103/PhysRevB.96.121405 2469-9950 https://hdl.handle.net/10356/87483 http://hdl.handle.net/10220/46733 10.1103/PhysRevB.96.121405 en Physical Review B © 2017 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: [http://dx.doi.org/10.1103/PhysRevB.96.121405]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 5 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics Topological Phases of Matter Topological Effects in Photonic Systems Mansha, Shampy Chong, Yi Dong Robust edge states in amorphous gyromagnetic photonic lattices |
| title | Robust edge states in amorphous gyromagnetic photonic lattices |
| title_full | Robust edge states in amorphous gyromagnetic photonic lattices |
| title_fullStr | Robust edge states in amorphous gyromagnetic photonic lattices |
| title_full_unstemmed | Robust edge states in amorphous gyromagnetic photonic lattices |
| title_short | Robust edge states in amorphous gyromagnetic photonic lattices |
| title_sort | robust edge states in amorphous gyromagnetic photonic lattices |
| topic | DRNTU::Science::Physics Topological Phases of Matter Topological Effects in Photonic Systems |
| url | https://hdl.handle.net/10356/87483 http://hdl.handle.net/10220/46733 |
| work_keys_str_mv | AT manshashampy robustedgestatesinamorphousgyromagneticphotoniclattices AT chongyidong robustedgestatesinamorphousgyromagneticphotoniclattices |