Driven Odd Elasticity in Passive Mechanical Metamaterials
arXiv:2607.13997
The paper demonstrates how passive chiral gears and a square‑lattice metamaterial can produce driven odd elasticity, creating a non‑reciprocal shear response and enabling non‑conservative work and non‑Hermitian skin effects without active control.
Abstract
We present a mechanical mechanism leveraging passive mechanical components, i.e. chiral gears and a square lattice metamaterial, to demonstrate driven odd elasticity in a mechanical metamaterial. The mechanism couples tension and shear in a non-reciprocal way, resulting in an odd shear modulus. The emergence of this odd shear modulus enables non-conservative work in a standard quasistatic strain cycle, and further enables the non-Hermitian skin effect in dynamics. Our results demonstrate that odd elasticity can be achieved in mechanical structures using passive elements without electronic components coupled with feedback or robotic control systems.
6 pages, 4 figures