Mott insulator

A Mott insulator is a type of material that, despite having electrons in its structure that could conduct electricity, acts as an insulator because of strong interactions between those electrons. In most materials, electrons move freely, allowing electricity to flow. However, in a Mott insulator, the electrons repel each other so strongly that they become fixed in place, preventing electrical current. This behavior arises from electron-electron interactions overriding what would typically be conduction based on the material's atomic structure, making the material an insulator even though its basic composition suggests it should conduct.