A quantum critical point is a special class of continuous phase transition that takes place at the absolute zero of temperature, typically in a material where the phase transition temperature has been driven to zero by the application of a pressure, field or through doping. Conventional phase transitions occur at finite temperature, when the growth of random thermal fluctuations leads to a change in the physical state of a system. Condensed matter physics research over the past few decades has revealed a new class of phase transitions, called a quantum phase transition, which take place at absolute zero, and which are driven by the zero point quantum fluctuations associated with Heisenberg's uncertainty principle.
Other articles related to "quantum, quantum critical point, quantum critical":
... In physics, a quantum phase transition (QPT) is a phase transition between different quantum phases (phases of matter at zero temperature) ... Contrary to classical phase transitions, quantum phase transitions can only be accessed by varying a physical parameter - such as magnetic field or pressure ... abrupt change in the ground state of a many-body system due to its quantum fluctuations ...
... What happens when a quantum critical point is affected by noise? An intuitive guess would be that the external noise defines an effective temperature ... problem and break the scale invariance of the quantum critical point ... On the contrary, it was recently found that certain types of noise can induce a non-equilibrium quantum critical state ...
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