Higher-order topological states in photonic kagome crystals with long-range interactions
| Autor: | Maxim A. Gorlach, Xiang Ni, Alexander B. Khanikaev, Andrea Alù, Dmitry Filonov, Dmitry Zhirihin, Mengyao Li, Alexey P. Slobozhanyuk |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Topological insulator Lattice (order) 0103 physical sciences Edge states Photonics 0210 nano-technology business Curse of dimensionality |
| Zdroj: | Nature Photonics. 14:89-94 |
| ISSN: | 1749-4893 1749-4885 |
| Popis: | Photonic topological insulators enable topological boundary modes that are resilient to defects and disorder, irrespective of manufacturing precision. This property is known as topological protection. Although originally limited to dimensionality of modes one lower than that of topological insulators, the recently discovered higher-order topological insulators (HOTIs) offer topological protection over an extended range of dimensionalities. Here, we introduce a photonic HOTI with kagome lattice that exhibits topological bulk polarization, leading to the emergence of one-dimensional edge states, as well as higher-order zero-dimensional states confined to the corners of the structure. Interestingly, in addition to the corner states due to nearest-neighbour interactions, we discover a new class of topological corner states induced by long-range interactions and specific to photonic systems. Our findings demonstrate that photonic HOTIs possess richer physics than their condensed-matter counterparts, offering opportunities for engineering novel designer electromagnetic states with unique topological robustness. One- and zero-dimensional optical states are revealed in photonic higher-order topological insulators. |
| Databáze: | OpenAIRE |
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