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20 August 2020 Photonic higher-order topological states induced by long-range interactions
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Abstract
we demonstrate 2D photonic HOTI (PHOTI) with topological states two dimensions lower than the one of the host system. We consider a photonic metacrystal of distorted Kagome lattice geometry that exhibits topological bulk polarization, leading to the emergence of 1D topological edge states and of higher order 0D states confined to the corners of the structure. Interestingly, in addition to corner states due to the nearest neighbour interactions and protected by generalized chiral symmetry 1, we discover and take advantage of a new class of topological corner states sustained by long-range interactions, available in wave-based systems, such as in photonics. Our findings demonstrate that photonic HOTIs possess richer physics compared to their condensed matter counterparts, offering opportunities for engineering novel designer electromagnetic states with unique topological robustness.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mengyao Li, Dmitry Zhirihin, Maxim Gorlach, Xiang Ni, Dmitry Filonov, Alexey Slobozhanyuk, Andrea Alù, and Alexander B. Khanikaev "Photonic higher-order topological states induced by long-range interactions", Proc. SPIE 11460, Metamaterials, Metadevices, and Metasystems 2020, 114600A (20 August 2020); https://doi.org/10.1117/12.2569326
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