Quantum Criticality describes the behavior of systems near a quantum phase transition, where fluctuations occur even at absolute zero temperature. At a quantum critical point, quantum fluctuations dominate system behavior over large length and time scales. Quantum criticality influences physical properties such as conductivity, magnetism, and heat capacity. It is particularly relevant in strongly correlated electron systems. Quantum critical phenomena help explain unconventional superconductivity and non-classical material behavior. Studying quantum criticality provides insight into emergent phenomena and universal scaling laws. It is a key concept linking quantum mechanics, statistical physics, and condensed matter theory.
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