Levin and Wen proposed string-net condensation as the generating mechanism for a form of this property associated with gapless boundary excitations that are robust against any local perturbations.
A form of this property manifests as the destruction of anti-nodal coherence peaks in the local density of states spectra of under-doped cuprate superconductors. Whether a certain quantity measuring this property obeys a conservation law di㻈ferentiates Class A and Class B Hohenberg-Halperin models. Levin and Wen proposed string-net condensation as the generating mechanism for a form of this property associated with gapless boundary excitations that are robust against any local perturbations. The degenerate ground states observed in the fractional quantum Hall e㻈fect possess that "topological" form of this property. The free energy is expanded in a power series as a function of a parameter named for this property in Lev Landau's theory of continuous phase transitions. For 10 points, name this property characterized by a correlation length that may be short-range or long-range.
A form of this property manifests as the destruction of anti-nodal coherence peaks in the local density of states spectra of under-doped cuprate superconductors.
order [accept word forms; or charge order; or topological order; or order parameter; or short-range order; or long-range order; prompt on correlation or entanglement]