Probing Weyl Physics with One-dimensional Sonic Crystals

Abstract

Recently, intense efforts have been devoted to realizing classical analogues of various topological phases of matter. In this Letter, we explore the intriguing Weyl physics by a simple one-dimensional sonic crystal, in which two extra structural parameters are combined to construct a synthetic three-dimensional space. Based on our underwater ultrasonic experiments, we have not only observed the synthetic Weyl points directly, but also probed the novel reflection phase singularity that connects inherently with the topological robustness of Weyl points. As a smoking gun evidence of the topological states of matter, the presence of nontrivial interface modes has been demonstrated further. All experimental data agree well with our full-wave simulations. As the first realization of topological acoustics in synthetic space, our study exhibits great potential of probing high-dimensional topological phenomena by such easily-fabricated and -detected low-dimension acoustic systems.

Accepted by PRL

References in corpus (29)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Weyl Semimetal in a Topological Insulator Multilayer
• Experimental discovery of Weyl semimetal TaAs
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Topological States and Adiabatic Pumping in Quasicrystals
• Experimental observation of Weyl points
• Observation of chiral edge states with neutral fermions in synthetic Hall ribbons
• Visualizing edge states with an atomic Bose gas in the quantum Hall regime
• Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
• A Four Dimensional Generalization of the Quantum Hall Effect
• Photonic topological pumping through the edges of a dynamical four-dimensional quantum Hall system
• Synthetic Dimension in Photonics
• Exploring 4D Quantum Hall Physics with a 2D Topological Charge Pump
• Topological negative refraction of surface acoustic waves in a Weyl phononic crystal
• Synthetic gauge fields and Weyl point in Time-Reversal Invariant Acoustic Systems
• Synthetic dimensions in integrated photonics: From optical isolation to 4D quantum Hall physics
• Quantum simulation of an extra dimension
• Experimental observation of optical Weyl points
• Photonic gauge potential in a system with a synthetic frequency dimension
• Four-Dimensional Quantum Hall Effect with Ultracold Atoms
• Multi-terminal Josephson junctions as topological materials
• Observation of topological transitions in interacting quantum circuits
• Acoustic type-II Weyl nodes from stacking dimerized chains
• Acoustic transmission enhancement through a periodically-structured stiff plate without any opening
• Extraordinary acoustic reflection enhancement by acoustically-transparent thin plates
• Experimental Observation of Acoustic Weyl Points and Topological Surface States
• A Five Dimensional Generalization of the Topological Weyl Semimetal

Cited by in corpus (16)

• Topological acoustics
• Acoustic realization of quadrupole topological insulators
• Experimental Realization of Weyl Exceptional Rings in a Synthetic Three-Dimensional Non-Hermitian Phononic Crystal
• Four-Dimensional Higher-Order Chern Insulator and Its Acoustic Realization
• A comprehensive review on developments of synthetic dimensions
• Tracking valley topology with synthetic Weyl paths
• Single Pair of Weyl Points in Nonmagnetic Crystals
• Fermi arc reconstruction in synthetic photonic lattice
• Zero-index Weyl metamaterials
• Exceptional Cones in 4D Parameter Space
• Weyl point immersed in a continuous spectrum: an example from superconducting nanostructures
• Spintronics with a Weyl point in superconducting nanostructures
• Realization of topological superlattices and the associated interface states in one-dimensional plasmonic crystals
• Quantum walk with coherent multiple translations induces fast quantum gate operations
• Realization of Photonic Charge-2 Dirac Point by Engineering Super-modes in Topological Superlattices
• Fourth-Order Topological Insulator via Dimensional Reduction