Tunable three-way valley Hall energy-splitter: venturing beyond graphene-like structures
arXiv:1901.01937 · doi:10.1103/PhysRevApplied.15.054056
Abstract
Strategically combining four structured domains creates the first ever three-way topological energy-splitter; remarkably, this is only possible using a square, or rectangular, lattice, and not the graphene-like structures more commonly used in valleytronics. To achieve this effect, the two mirror symmetries, present within all fully-symmetric square structures, are broken; this leads to two nondistinct interfaces upon which valley-Hall states reside. These interfaces are related to each other via the time-reversal operator and it is this subtlety that allows us to ignite the third outgoing lead. The geometrical construction of our structured medium allows for the three-way splitter to be adiabatically converted into a wave steerer around sharp bends. Due to the tunability of the energies directionality by geometry, our results have far-reaching implications for applications such as beam-splitters, switches and filters across wave physics.
References in corpus (37)
- Topological Photonics
- Topological Photonics
- Review article: Linear optical quantum computing
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Acoustic topological insulator and robust one-way sound transport
- Observation of topological valley transport of sound in sonic crystals
- All-Si Valley-Hall Photonic Topological Insulator
- Topological classification of crystalline insulators through band structure combinatorics
- Topologically-protected refraction of robust kink states in valley photonic crystals
- Topological Phases in Two-Dimensional Materials: A Brief Review
- Direct Observation of Valley-polarized Topological Edge States in Designer Surface Plasmon Crystals
- Valley Vortex States in Sonic Crystals
- Valley-protected backscattering suppression in silicon photonic graphene
- Valley-contrasting orbital angular momentum in photonic valley crystals
- Experimental realization of on-chip topological nanoelectromechanical metamaterials
- Electronic Highways in Bilayer Graphene
- Topological phononic insulator with robustly pseudospin-dependent transport
- Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
- Observation of Acoustic Valley Vortex States and Valley-Chirality Locked Beam Splitting
- Current partition at topological zero-line intersections
- Theory and Experimental Investigation of the Quantum Valley Hall Effect
- Novel topological beam-splitting in photonic crystals
- Observation of edge waves in a two-dimensional Su-Schrieffer-Heeger acoustic network
- Gapless Unidirectional Photonic Transport Using All-Dielectric Kagome Lattices
- Observation of topological edge states of sound at a momentum away from the high-symmetry point
- Designing multi-directional energy-splitters and topological valley supernetworks
- Helical scattering and valleytronics in bilayer graphene
- Geometrically navigating topological platonic modes around gentle and sharp bends
- Valley-projected edge modes observed in underwater sonic crystals
- Manipulating Topological Valley Modes in Plasmonic Metasurfaces
- Observations of symmetry induced topological mode steering in a reconfigurable elastic plate
- Experimental observations of topologically guided water waves within non-hexagonal structures
- Photonic realization of topologically protected bound states in domain-wall waveguide arrays
- Topological obstructed atomic limit by annihilating Dirac fermions
- Experimental demonstration of valley-Hall topological photonic crystal at telecommunication wavelengths
- Localising elastic edge waves via the topological rainbow effect
- Rayleigh-Bloch, topological edge and interface waves for structured elastic plates