Design of GaAs-based valley phononic crystals with multiple complete phononic bandgaps at ultra-high frequency
arXiv:1901.01407 · doi:10.7567/1882-0786/ab0772
Abstract
We report the design of GaAs-based monolithic valley phononic crystals (VPnCs) with multiple complete phononic bandgaps, which support simultaneous valley-protected edge states with different symmetries in the gigahertz (GHz) range. Rotation of triangular holes in the unit cells breaks the mirror symmetry, and this orientation degree of freedom enables the structures to exhibit different valley vortex chiralities. We numerically demonstrate the transport of multi-band valley-protected edge states with suppressed backscattering at the sharp corners of the interfaces between different VPnCs. Such monolithic semiconductor structures pave the way for ultra-high frequency topological nanophononic applications by using the lithographic technique.
arXiv comment13 pages, 5 figures
References in corpus (30)
- Topological Insulators
- Topological insulators and superconductors
- Topological Photonics
- Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
- Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
- Imaging topological edge states in silicon photonics
- Scheme to Achieve Silicon Topological Photonics
- Robust optical delay lines via topological protection
- Topological Acoustics
- Observation of phononic helical edge states in a mechanical 'topological insulator'
- Topological Phononic Crystals with One-Way Elastic Edge Waves
- Topological mechanics of gyroscopic metamaterials
- Topologically protected elastic waves in phononic metamaterials
- Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
- Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
- Valley Vortex States in Sonic Crystals
- Observation of topological valley modes in an elastic hexagonal lattice
- Topological quantization in units of the fine structure constant
- Tunable Acoustic Valley-Hall Edge States in Reconfigurable Phononic Elastic Waveguides
- Tunable topological phononic crystals
- Topological photonic crystal nanocavity laser
- Coexistence of quantized and non-quantized geometric phases in quasi-one-dimensional systems without inversion symmetry
- Subwavelength and directional control of flexural waves in zone-folding induced topological plates
- Manipulation of Dirac Cones in Mechanical Graphene
- Pseudomagnetic fields for sound at the nanoscale
- Snowflake Topological Insulator for Sound Waves
- Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
- Demonstrating an in-situ topological band transition in cylindrical granular chains
- On-chip phononic time lens
- Dial-in Topological Metamaterials Based on Bistable Stewart Platform