Zone folding induced topological insulators in phononic crystals
arXiv:1706.05668 · doi:10.1103/PhysRevB.96.184305
Abstract
This letter investigates a flow-free, pseudospin-based acoustic topological insulator. Zone folding, a strategy originated from photonic crystal, is used to form double Dirac cones in phononic crystal. The lattice symmetry of the phononic crystal is broken by tuning the size of the center "atom" of the unit cell in order to open the nontrivial topological gap. Robust sound one-way propagation is demonstrated both numerically and experimentally. This study provides a flexible approach for realizing acoustic topological insulators, which are promising for applications such as noise control and waveguide design.
References in corpus (7)
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
- Scheme to Achieve Silicon Topological Photonics
- Topological Acoustics
- Observation of phononic helical edge states in a mechanical 'topological insulator'
- Observation of topological valley transport of sound in sonic crystals
- Valley Vortex States in Sonic Crystals