C. Kern and M. Wegener

Phys. Rev. Materials 3, 015204 (2019)

Abstract:

We realize classical Hall bars, made of chain-mail-inspired cubic-symmetry 3D metamaterials composed of interlinked hollow tori, contacted to printed circuit boards. This step is a prerequisite for refined experiments compared to our previous probe-station based measurements as well as for potential applications of 3D Halleffect metamaterials in general. On this basis, we systematically study the dependence of the Hall voltage on the relative orientation of the 3D metamaterial crystallographic axes with respect to the applied static magnetic field vector and the imposed current flow direction. Our findings are consistent with an isotropic sign-reversed Hall coefficient, which has been predicted by homogenization theory.