A quantum critical point (QCP) is a theoretical concept in condensed matter physics that denotes a point at zero temperature where a continuous phase transition occurs due to quantum fluctuations. Unlike classical phase transitions that can be influenced by temperature and external parameters (like pressure or magnetic field), quantum critical points are affected primarily by quantum mechanical effects, specifically as they relate to changes in certain control parameters like magnetic field, doping level, or pressure.
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A quantum critical point is a continuous zero-temperature phase transition driven by a nonthermal control parameter. Quantum and thermal fluctuations near it are organized by a dynamical critical exponent.