The axion coupling in topological insulators (TI), which couples electric polarization (magnetization) with the magnetic (electric) field, is known to support a small-distance Casimir repulsion and a large-distance Casimir attraction with a zero-force stable equilibrium between TI plates. By enhan … [J. Appl. Phys. 113, 204302 (2013)] published Fri May 24, 2013.
link to article (opens in new tab)