IÈ^ (IMAGE) Max Planck Institute for Chemical Physics of Solids Caption This is the scheme of a Weyl-semimetal-based axion insulator. Credit Johannes Gooth Usage Restrictions © MPI CPfS License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.