Three-Dimensional Higher-Order Topological Insulator Protected by Cubic Symmetry
| Autor: | Valerii I. Kachin, Maxim A. Gorlach |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Trace (linear algebra) Condensed Matter - Mesoscale and Nanoscale Physics Structure (category theory) FOS: Physical sciences General Physics and Astronomy Charge (physics) State (functional analysis) Polarization (waves) Symmetry (physics) Theoretical physics Topological insulator Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Physics - Optics Optics (physics.optics) Curse of dimensionality |
| Zdroj: | Physical Review Applied. 16 |
| ISSN: | 2331-7019 |
| 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: | OpenAIRE |
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