Topological transition in spiral elastic valley metamaterials

TL;DR

This paper presents strategies to induce topological transitions in spiral elastic valley metamaterials through parameter modulation, enabling control over elastic wave propagation and topological edge states.

Contribution

It introduces a novel scheme for topological transition in elastic metamaterials using spiral parameter modulations, expanding the design space for topological elastic wave control.

Findings

Berry curvature and valley Chern number evolve with spiral parameters

Topological valley edge states can be achieved through parameter modulation

Enhanced control over elastic wave manipulation in metamaterials

Abstract

Elastic valley metamaterials offer an excellent platform to manipulate elastic waves and have potential applications in energy harvesting and elastography. Here we introduce a series of strategies to realize topological transition in spiral elastic valley metamaterials by parameter modulations. We show the evolution of Berry curvature and valley Chern number as a function of inherent parameters of spiral, which further results in a general scheme to achieve topological valley edge states. Our strategy leverages multiple degrees of freedom in spiral elastic valley metamaterials to provide enhanced opportunities for desired topological states.