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 axion-like effect on the
electromagnetism, towards 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 new force mediated by light particles at the micrometer
scale.Comment: 28 pages, 9 figure