Superdielectric: the hidden phase between metals and insulators

Solid-state physics traditionally recognizes two distinct types of materials: metals, which host delocalized states and screen perfectly applied electric fields, and insulators, in which all electrons are localized and the dielectric constant is finite. We demonstrate that disorder in materials with chiral symmetry enables a novel intermediate phase — superdielectric — in which the material completely screens the applied static electric field while remaining an insulator.