Zone folding induced topological insulators in phononic crystals

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.

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Cited by in corpus (23)

• Topological acoustics
• Elastic higher-order topological insulator with topologically protected corner states
• Topological Sound
• Simultaneous Observation of Topological Edge State and Exceptional Point in an Open and Non-Hermitian System
• Subwavelength and directional control of flexural waves in zone-folding induced topological plates
• Actively controllable topological phase transition in phononic beam systems
• Reconfigurable Topological Photonic Crystal
• Elastic quantum spin-Hall effect in Kagome lattices
• Majorana-like zero modes in Kekulé distorted sonic lattices
• Magic-angle Bilayer Phononic Graphene
• Topological Phononic Logic
• Self-ordering induces multiple topological transitions for elastic waves in phononic crystals
• Topologically protected pseudospins in 2D spring-mass system
• Guiding Robust Valley-dependent Edge States by Surface Acoustic Waves
• Space-Time Phononic Crystals with Anomalous Topological Edge States
• Synthetic Kramers pair in phononic elastic plates and helical edge states on a dislocation interface
• Higher-order topological spin Hall effect of sound
• Non-conventional topological band properties and gapless helical edge states in elastic phononic waveguides with Kekulé distortion
• Topological phase transition in disordered elastic quantum spin Hall system
• Confining and channeling sound through coupled resonators
• Bending sound around sharp corners without using topological edge states
• Pseudospin-valley-coupled phononic topological insulator with edge and corner states
• Topologically protected long-range coherent energy transfer