Mott insulator

A Mott insulator is a type of material that behaves as an insulator due to strong electron-electron interactions, despite having the necessary conditions (like a partially filled electronic band) that would typically lead to metallic behavior. In a metallic system, electrons can move freely and conduct electricity; however, in Mott insulators, the interactions between electrons are so strong that they hinder their movement and localization, resulting in insulating behavior.