Zero Casimir force in axion electrodynamics and the search for a new force

Abstract

We point out that there is a stable configuration of metal plates where the Casimir force is vanishing in axion electrodynamics. We consider a concrete setup involving Weyl semimetals, which hosts an axionlike effect on the electromagnetism, toward the measurement of the axionic effect on the Casimir force. Our setup realizes zero Casimir force between metals and may be useful for the search for a new force mediated by light particles at the micrometer scale.