Topological valley crystals in a photonic Su-Schrieffer-Heeger (SSH) variant
arXiv:2208.09248 · doi:10.1063/5.0107211
Abstract
Progress on two-dimensional materials has shown that valleys, as energy extrema in a hexagonal first Brillouin zone, provides a new degree of freedom for information manipulation. Then valley Hall topological insulators supporting such-polarized edge states on boundaries were set up accordingly. In this paper, a two-dimensional valley photonic crystal composed of six tunable dielectric triangular pillars in unit cells is proposed in the photonic sense of a deformed Su-Schrieffer-Heeger (SSH) model. We reveal the vortex nature of valley states and establish the selection rules for valley polarized states. Based on the valley topology, a rhombus-shaped beam splitter waveguide is designed to verify the valley-chirality selection above. Our numerical results entail that this topologically protected edge states still maintain robust transmission at sharp corners, henceforth providing a feasible idea for valley photonic devices in THz regime.
References in corpus (36)
- Topological Insulators
- Topological insulators and superconductors
- Quantum Spin Hall Effect in Graphene
- Topological Order and the Quantum Spin Hall Effect
- Topological Photonics
- Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
- Scheme to Achieve Silicon Topological Photonics
- Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
- Terahertz topological photonics for on-chip communication
- All-Si Valley-Hall Photonic Topological Insulator
- A Silicon-on-Insulator Slab for Topological Valley Transport
- Topologically-protected refraction of robust kink states in valley photonic crystals
- Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
- Second-order photonic topological insulator with corner states
- Visualization of unidirectional optical waveguide using topological photonic crystals made of dielectric material
- Spontaneous Quantum Hall States in Chirally-stacked Few-Layer Graphene Systems
- Novel Topological Phase with Zero Berry Curvature
- Direct Observation of Valley-polarized Topological Edge States in Designer Surface Plasmon Crystals
- Valley Vortex States in Sonic Crystals
- Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
- Edge states in Graphene: from gapped flat band to gapless chiral modes
- Valley-contrasting orbital angular momentum in photonic valley crystals
- Valley-protected backscattering suppression in silicon photonic graphene
- Two-Dimensional Topological Insulator State and Topological Phase Transition in Bilayer Graphene
- Choreographed entangle dances: topological states of quantum matter
- Accidental degeneracy and topological phase transitions in two-dimensional core-shell dielectric photonic crystals
- Graphene Nanobubbles as Valley Filters and Beamsplitters
- Scattering-Free Optical Edge States between Heterogeneous Photonic Topological Insulators
- Valley kink states and topological channel intersections in substrate-integrated photonic circuitry
- Electromagnetic-dual metasurfaces for topological states along a one-dimensional interface
- Z_2 Photonic topological insulators in the visible wavelength range for robust nanoscale photonics
- Valley-dependent Corner States in Honeycomb Photonic Crystal without Inversion Symmetry
- Higher-order valley vortices enabled by synchronized rotation in a photonic crystal
- Topological edge states of Kekulé-type photonic crystals induced by a synchronized rotation of unit cells