Acoustic type-II Weyl nodes from stacking dimerized chains

Abstract

Lorentz-violating type-II Weyl fermions, which were missed in Weyl's prediction of nowadays classified type-I Weyl fermions in quantum field theory, have recently been proposed in condensed matter systems. The semimetals hosting type-II Weyl fermions offer a rare platform for realizing many exotic physical phenomena that are different from type-I Weyl systems. Here we construct the acoustic version of type-II Weyl Hamiltonian by stacking one-dimensional dimerized chains of acoustic resonators. This acoustic type-II Weyl system exhibits distinct features in finite density of states and unique transport properties of Fermi-arc-like surface states. In a certain momentum space direction, the velocity of these surface states are determined by the tilting direction of the type-II Weyl nodes, rather than the chirality dictated by the Chern number. Our study also provides an approach of constructing acoustic topological phases at different dimensions with the same building blocks.

11 pages, 4 figures

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Cited by in corpus (46)

• Weyl and Dirac Semimetals in Three Dimensional Solids
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• Topological acoustics
• Topological negative refraction of surface acoustic waves in a Weyl phononic crystal
• Topological Sound
• Experimental observation of optical Weyl points
• Classification of topological phonons in linear mechanical metamaterials
• Realization of an acoustic third-order topological insulator
• Topological interface modes in local resonant acoustic systems
• Projectively enriched symmetry and topology in acoustic crystals
• Su-Schrieffer-Heeger Model Inspired Acoustic Interface States and Edge States
• Intrinsically polar elastic metamaterials
• Three-dimensional acoustic double-zero-index medium with a Dirac-like point
• Experimental Observation of Acoustic Weyl Points and Topological Surface States
• Probing Weyl Physics with One-dimensional Sonic Crystals
• Soft self-assembly of Weyl materials for light and sound
• Ideal type-II Weyl phonons in wurtzite CuI
• Acoustic Su-Schrieffer-Heeger lattice: Direct mapping of acoustic waveguides to Su-Schrieffer-Heeger model
• Ideal type-II Weyl points in topological circuits
• Three-Dimensional Topological Twistronics
• Ideal type-II Weyl phase and topological transition in phononic crystals
• Single Pair of Weyl Points in Nonmagnetic Crystals
• Deterministic scheme for two-dimensional type-II Dirac points and experimental realization in acoustics
• Hawking fragmentation and Hawking attenuation in Weyl semimetals
• Elastic Weyl points and surface arc states in 3D structures
• Zero-index Weyl metamaterials
• Universal phase transition and band structures for spinless nodal-line and Weyl semimetals
• Creation and annihilation of mobile fractional solitons in atomic chains
• Weyl points and topological surface states in a three-dimensional elastic lattice
• Horizon physics of quasi-one-dimensional tilted Weyl cones on a lattice
• Colloquium: Synthetic quantum matter in non-standard geometries
• Realising Type II Weyl Points in an Optical Lattice
• Spin-1 Weyl Point and Surface Arc State in a Chiral Phononic Crystal
• Ideal type-II Weyl points in twisted one-dimensional dielectric photonic crystals
• Optical interface states protected by synthetic Weyl points
• Anisotropic non-linear optical response of nodal loop materials
• Detection of Fermi Arcs in Weyl Semimetals through Surface Negative Refraction
• A numerically exact study of Weyl superconductivity
• Acoustic semimetal with Weyl points and surface states
• Optical Black-hole Analog Created by Topological Phase Transition with a Long-lived Horizon
• Topological boundary states in engineered quantum-dot molecules on the InAs(111)A surface
• Emergent Weyl-like points in periodically modulated systems
• Realization of Photonic Charge-2 Dirac Point by Engineering Super-modes in Topological Superlattices
• Embedding 1D BDI topological dynamics into continuous elastic plates
• Observation of Quadratic (Charge-2) Weyl Point Splitting in Near-Infrared Photonic Crystals
• Advances in Synthetic Gauge Fields for Light Through Dynamic Modulation