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<p>change</p> <p><b>New page</b></p><div>{{short description|Quantum states of matter at zero temperature}}<br /> &#039;&#039;&#039;Quantum phases&#039;&#039;&#039; are quantum states of matter at zero temperature. Even at zero temperature a quantum-mechanical system has quantum fluctuations and therefore can still support phase transitions. As a physical parameter is varied, quantum fluctuations can drive a phase transition into a different phase of matter. An example of a canonical quantum phase transition is the well-studied Superconductor Insulator Transition in disordered thin films which separates two quantum phases having different symmetries. Quantum magnets provide another example of QPT. The discovery of new quantum phases is a pursuit of many scientists. These phases of matter exhibit properties and symmetries which can potentially be exploited for technological purposes and the benefit of mankind.<br /> <br /> The difference between these states and classical states of matter is that classically, materials exhibit different phases which ultimately depends on the change in temperature and/or density or some other macroscopic property of the material whereas quantum phases can change in response to a change in a different type of order parameter (which is instead a parameter in the [[Physics:Hamiltonian mechanics#Mathematical formalism|Hamiltonian]] of the system, unlike the classical case) of the system at zero temperature – temperature does not have to change. The order parameter plays a role in quantum phases analogous to its role in classical phases. Some quantum phases are the result of a superposition of many other quantum phases.<br /> <br /> ==See also==<br /> <br /> * [[Physics:Quantum phase transition|Quantum phase transition]]<br /> * [[Physics:Phase transitions|Classical phase transitions]]<br /> * [[Physics:Quantum critical point|Quantum critical point]]<br /> <br /> ==References==<br /> <br /> *{{Cite book |last=Sachdev |first=Subir |title=Quantum Phase Transitions |publisher=Cambridge University Press |year=2000 |isbn=978-0-521-00454-1 |url-access=registration |url=https://archive.org/details/quantumphasetran0000sach }}<br /> *{{Cite book |last=Carr |first=Lincoln D. |title=Understanding Quantum Phase Transitions |publisher=CRC Press |year=2010 |isbn=978-1-4398-0251-9}}<br /> <br /> [[Category:Quantum phases| ]]<br /> [[Category:Condensed matter physics]]<br /> <br /> {{Sourceattribution|Quantum phases}}</div>

imported>WikiHarold