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Title: Observation of protected photonic edge states induced by real-space topological lattice defects
Authors: Wang, Qiang
Xue, Haoran
Zhang, Baile
Chong, Yidong
Keywords: Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Mesoscopic Systems and Quantum Hall Effect
Physics - Optics
Issue Date: 2020
Source: 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
Project: MOE2016-T3-1-006
Journal: Physical Review Letters
Abstract: 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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.124.243602
Rights: © 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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