e/Superconductor Insulator Transition

Information
has gloss	eng: The Superconductor Insulator Transition is an example of a quantum phase transition, whereupon tuning some parameter in the Hamiltonian, a dramatic change in the behavior of the electrons occurs. The nature of how this transition occurs is disputed, and many studies seek to understand how the order parameter, \Psi =\Delta \exp(i\theta), changes. Here \Delta is the amplitude of the order parameter, and \theta is the phase. Most theories involve either the destruction of the amplitude of the order parameter - by a reduction in the density of states at the Fermi surface, or by destruction of the phase coherence; which results from the proliferation of vortices.
lexicalization	eng: Superconductor Insulator Transition
instance of	e/Quantum phases