Observation of phononic helical edge states in a mechanical 'topological insulator'

Abstract

A topological insulator is characterized by a dichotomy between the interior and the edge of a finite system: While the bulk has a non-zero energy gap, the edges are forced to sustain excitations traversing these gaps. Originally proposed for electrons governed by quantum mechanics, it has remained an important open question if the same physics can be observed for systems obeying Newton's equations of motion. Here, we report on measurements that characterize the collective behavior of mechanical oscillators exhibiting the phenomenology of the quantum spin hall effect. The phononic edge modes are shown to be helical and we demonstrate their topological protection via the stability against imperfections. Our results open the door to the design of topological acoustic meta-materials that can capitalize on the stability of the surfaces phonons as reliable wave guides.

arXiv comment6 pages, 4 figures

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• Optical Control of Topological Polariton Phase in a Perovskite Lattice
• SAW interdigitated transducers as topological mechanical metamaterial
• Dynamics of transport by helical edge states
• Robust zero-energy states in two-dimensional Su-Schrieffer-Heeger topological insulators
• Projected branes as platforms for crystalline, superconducting, and higher-order topological phases
• Negative flow of energy in a mechanical wave
• Meta-fences: blocking waves utilizing a layer of identical tiny scatters
• Topological bands in the continuum using Rydberg states
• Topological Photonics on a Small Scale
• Anomalous nonreciprocal topological networks: stronger than Chern insulators
• Vortical Quantum Memory
• Phase-Space Topology and Spectral Flow in Screened Magnetized Plasmas
• Immutable quantized transport in Floquet chains
• Design and characterization of all two-dimensional fragile topological bands
• Exceptional light propagation via generalized bulk-edge correspondence
• Observation of the topological edge state in X-ray band