Observation of protected photonic edge states induced by real-space topological lattice defects

Topological defects (TDs) in crystal lattices are elementary lattice imperfections that cannot be removed by local perturbations, due to their real-space topology. In the emerging field of topological photonics, photonic topological edge states arise from the nontrivial topology of the band structur...

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Main Authors: Wang, Qiang, Xue, Haoran, Zhang, Baile, Chong, Yidong
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/145068
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1450682023-02-28T19:28:50Z Observation of protected photonic edge states induced by real-space topological lattice defects Wang, Qiang Xue, Haoran Zhang, Baile Chong, Yidong School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) Physics - Mesoscopic Systems and Quantum Hall Effect Physics - Mesoscopic Systems and Quantum Hall Effect Physics - Optics Science::Physics Topological Defects Valley Photonic Crystals Topological defects (TDs) in crystal lattices are elementary lattice imperfections that cannot be removed by local perturbations, due to their real-space topology. In the emerging field of topological photonics, photonic topological edge states arise from the nontrivial topology of the band structure defined in momentum space and are generally protected against defects. Here we show that adding TDs into a valley photonic crystal generates a lattice disclination that acts like a domain wall and hosts photonic topological edge states. Unlike previous topological waveguides, the disclination forms an open arc and functions as a free-form waveguide connecting a pair of TDs of opposite topological charge. This interplay between the real-space topology of lattice defects and momentum-space band topology provides a novel scheme to implement large-scale photonic structures with complex arrangements of robust topological waveguides and resonators. Ministry of Education (MOE) Published version This work was supported by the Singapore MOE Academic Research Fund Tier 3 Grant No. MOE2016- T3-1-006, Tier 1 Grants No. RG187/18, and Tier 2 Grant No. MOE2018-T2-1-022(S). 2020-12-10T02:18:47Z 2020-12-10T02:18:47Z 2020 Journal Article Wang, Q., Xue, H., Zhang, B., & Chong, Y. (2020). Observation of protected photonic edge states induced by real-space topological lattice defects. Physical Review Letters, 124(24), 243602-. doi:10.1103/PhysRevLett.124.243602 0031-9007 https://hdl.handle.net/10356/145068 10.1103/PhysRevLett.124.243602 32639804 24 124 en MOE2016-T3-1-006 RG187/18 MOE2018-T2-1-022 Physical Review Letters © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Optics
Science::Physics
Topological Defects
Valley Photonic Crystals
spellingShingle Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Optics
Science::Physics
Topological Defects
Valley Photonic Crystals
Wang, Qiang
Xue, Haoran
Zhang, Baile
Chong, Yidong
Observation of protected photonic edge states induced by real-space topological lattice defects
description Topological defects (TDs) in crystal lattices are elementary lattice imperfections that cannot be removed by local perturbations, due to their real-space topology. In the emerging field of topological photonics, photonic topological edge states arise from the nontrivial topology of the band structure defined in momentum space and are generally protected against defects. Here we show that adding TDs into a valley photonic crystal generates a lattice disclination that acts like a domain wall and hosts photonic topological edge states. Unlike previous topological waveguides, the disclination forms an open arc and functions as a free-form waveguide connecting a pair of TDs of opposite topological charge. This interplay between the real-space topology of lattice defects and momentum-space band topology provides a novel scheme to implement large-scale photonic structures with complex arrangements of robust topological waveguides and resonators.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Wang, Qiang
Xue, Haoran
Zhang, Baile
Chong, Yidong
format Article
author Wang, Qiang
Xue, Haoran
Zhang, Baile
Chong, Yidong
author_sort Wang, Qiang
title Observation of protected photonic edge states induced by real-space topological lattice defects
title_short Observation of protected photonic edge states induced by real-space topological lattice defects
title_full Observation of protected photonic edge states induced by real-space topological lattice defects
title_fullStr Observation of protected photonic edge states induced by real-space topological lattice defects
title_full_unstemmed Observation of protected photonic edge states induced by real-space topological lattice defects
title_sort observation of protected photonic edge states induced by real-space topological lattice defects
publishDate 2020
url https://hdl.handle.net/10356/145068
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