2018/12/20 by Bi-Ye Xie, Guangxu Su, Guang-Xu Su +12 · 3 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Dielectric #Materials science #Metamaterials and Metasurfaces Applications #Multipole expansion #Optics #Optoelectronics #Photonic Crystals and Applications #Photonic crystal #Photonics #Physics #Quantum #Quantum mechanics #Topological Materials and Phenomena #Topological insulator #Topological order #Topology (electrical circuits) #cond-mat.mes-hall #physics.optics
paper · pdf · doi:10.1103/physrevlett.122.233903
published as Phys. Rev. Lett. 122, 233903 (2019) · 23 pages, 4 figures
arxiv created 2018/12/20 · openalex publication_date 2019/06/14 · arxiv updated 2019/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The studies of topological phases of matter have been developed from condensed matter physics to photonic systems, resulting in fascinating designs of robust photonic devices. Recently, higher-order topological insulators have been investigated as a novel topological phase of matter beyond the conventional bulk-boundary correspondence. Previous studies of higher-order topological insulators have been mainly focused on the topological multipole systems with negative coupling between lattice sites. Here we experimentally demonstrate that second-order topological insulating phases without negative coupling can be realized in two-dimensional dielectric photonic crystals. We visualize both one-dimensional topological edge states and zero-dimensional topological corner states by using the near-field scanning technique. Our findings open new research frontiers for photonic topological phases and provide a new mechanism for light manipulating in a hierarchical way.