Three-dimensional higher-order topological insulator protected by cubic symmetry
| Autor: | Kachin, Valerii I., Gorlach, Maxim A. |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 16, 024032 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.16.024032 |
| Popis: | Recently discovered photonic higher-order topological insulators enable unprecedented flexibility in the robust localization of light in structures of different dimensionality. While the potential of the two-dimensional systems is currently under active investigation, only a few studies explore the physics of the three-dimensional higher-order topological insulators. Here we propose a three-dimensional structure with cubic symmetry exhibiting vanishing bulk polarization but nonzero corner charge and hosting a zero-dimensional corner state mediated by the long-range interactions. We trace the evolution of the corner state with the next-nearest-neighbor coupling strength and prove the topological origin of the corner mode calculating the associated topological invariants. Our results thus reveal the potential of long-range couplings for the formation of three-dimensional higher-order topological phases. Comment: 12 pages, 9 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|