Tunable topological phononic crystals

Abstract

Topological insulators, first observed in electronic systems, have inspired many analogues in photonic and phononic crystals in which remarkable one-way propagation edge states are supported by topologically nontrivial bandgaps. Such bandgaps can be achieved by breaking the time-reversal symmetry to lift the degeneracy associated with Dirac cones at the corners of the Brillouin zone. Here, we report on our construction of a phononic crystal exhibiting a Dirac-like cone in the Brillouin zone center. We demonstrate that simultaneously breaking the time-reversal symmetry and altering the geometric size of the unit cell result in a topological transition that is verified by the Chern number calculation and edge mode analysis. The topology of the bandgap is tunable by varying both the velocity field and the geometric size; such tunability may dramatically enrich the design and use of acoustic topological insulators.

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Cited by in corpus (50)

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• Topological Sound
• Experimental Realization of Acoustic Chern Insulator
• Valley Topological Phases in Bilayer Sonic Crystals
• Tunable Acoustic Valley-Hall Edge States in Reconfigurable Phononic Elastic Waveguides
• Band topology in classical waves: Wilson-loop approach to topological numbers and fragile topology
• Topological phononic insulator with robustly pseudospin-dependent transport
• Actively controllable topological phase transition in phononic beam systems
• Zone folding induced topological insulators in phononic crystals
• Pseudomagnetic fields for sound at the nanoscale
• Pseudo-time-reversal symmetry and topological edge states in two-dimensional acoustic crystals
• Snowflake Topological Insulator for Sound Waves
• Design and Experimental Observation of Valley-Hall Edge States in Diatomic-Graphene-like Elastic Waveguides
• Topolectric circuits: Theory and construction
• Tunable light flow control in valley photonic crystal waveguide
• Topological insulators and semimetals in classical magnetic systems
• Topological interface modes in local resonant acoustic systems
• Experimental evidence of robust acoustic valley Hall edge states in a non-resonant topological elastic waveguide
• Four-Dimensional Higher-Order Chern Insulator and Its Acoustic Realization
• Metastable Modular Metastructures for On-Demand Reconfiguration of Band Structures and Non-Reciprocal Wave Propagation
• Self-ordering induces multiple topological transitions for elastic waves in phononic crystals
• Observation of topological edge states of sound at a momentum away from the high-symmetry point
• Dial-in Topological Metamaterials Based on Bistable Stewart Platform
• On the wave propagation analysis and supratransmission prediction of a metastable modular metastructure for non-reciprocal energy transmission
• Thermal Hall effect of magnons in collinear antiferromagnetic insulators: signatures of magnetic and topological phase transitions
• Tunable graphene phononic crystal
• Valley-projected edge modes observed in underwater sonic crystals
• L lines, C points and Chern numbers: understanding band structure topology using polarization fields
• Topological spin-Hall edge states of flexural wave in perforated metamaterial plates
• Interfacial waveforms in chiral lattices with gyroscopic spinners
• Designing topological interface states in phononic crystals based on the full phase diagrams
• Topologically protected elastic waves in one-dimensional phononic crystals of continuous media
• Topologically protected interface phonons in two-dimensional nanomaterials: hexagonal boron nitride and silicon carbide
• Topological phase transition in a stretchable photonic crystal
• Space-Time Phononic Crystals with Anomalous Topological Edge States
• Synthetic Kramers pair in phononic elastic plates and helical edge states on a dislocation interface
• Acoustic metamaterials with spinning components
• Photonic topological phase transition induced by material phase transition
• Design of GaAs-based valley phononic crystals with multiple complete phononic bandgaps at ultra-high frequency
• Polarization-dependent and Valley-protected Lamb Waves in Asymmetric Pillared Phononic Crystals
• Topological defects in Floquet systems: Anomalous chiral modes and topological invariant
• Controlling the Deformation of Metamaterials: Corner Modes via Topology
• Transport study of the wormhole effect in three-dimensional topological insulators
• Tunable topological edge modes in Su-Schrieffer-Heeger arrays
• Soft topological modes protected by symmetry in rigid mechanical metamaterials
• Topological mechanics of edge waves in Kagome lattices
• Low-frequency tunable topological interface states in soft phononic crystal cylinders
• Brillouin-Mandelstam Light Scattering Spectroscopy: Applications in Phononics and Spintronics
• Multi-dimensional wave steering with higher-order topological phononic crystal
• Experimental realization of three-dimensional elastic phononic topological insulator