 Quantum phase transition

Quantum phase transition refers to a fundamental change in the state of matter that occurs at absolute zero temperature (0 K) due to quantum mechanical effects rather than thermal fluctuations, which are more common in classical phase transitions. Unlike classical phase transitions, which occur as a system is heated or cooled and are often driven by changes in temperature and pressure (like the melting of ice to water), quantum phase transitions are induced by changes in external parameters such as magnetic fields, pressure, or chemical composition.