Topological Node-Lines in Mechanical Metacrystals

Abstract

Topological acoustic and elastic waves have recently emerged as an exciting interdisciplinary field which is still mainly focused on low-dimensional structures and model systems. Here we demonstrate numerically an elastic-wave analogue of topological node-lines in three-dimensional mechanical metacrystals with ribbon- or drumhead-like surface states. These two-dimensional topological surface states offer unprecedented, robust subwavelength confinement of elastic waves. Design principles for topological mechanical metamaterials, from both material and symmetry aspects, are unveiled and connected to fundamental conservation laws and nonsymmorphic space group. Our study paves the way toward the synergy between three-dimensional mechanical metamaterials and topological wave dynamics.

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Cited by in corpus (7)

• Band topology in classical waves: Wilson-loop approach to topological numbers and fragile topology
• Observation of a phononic higher-order Weyl semimetal
• Computation and data driven discovery of topological phononic materials
• Topological nodal states in circuit lattice
• Catalogue of topological phonon materials
• Three-dimensional flat Landau levels in an inhomogeneous acoustic crystal
• Experimental realization of three-dimensional elastic phononic topological insulator