quantum criticality

Quantum criticality refers to a peculiar phase transition that occurs at absolute zero temperature, where a material's properties change dramatically due to quantum effects rather than thermal heating. Unlike regular transitions, such as ice melting to water, quantum criticality involves fluctuations and interactions at the quantum level, leading to unusual behaviors in materials, like changes in conductivity or magnetism. It often signifies a delicate balance between different states and can influence various phenomena in condensed matter physics, impacting our understanding of superconductors and quantum computers. Essentially, it highlights the interplay between quantum mechanics and collective behavior in materials.