1303.6858 (D. Banerjee et al.)

The (2+1)-d U(1) Quantum Link Model Masquerading as Deconfined
Criticality    [PDF]

D. Banerjee, F. -J. Jiang, P. Widmer, U. -J. Wiese

The $(2+1)$-d U(1) quantum link model is a gauge theory, amenable to quantum simulation, with a spontaneously broken SO(2) symmetry emerging at a quantum phase transition. Its low-energy physics is described by a $(2+1)$-d $\RP(1)$ effective field theory, perturbed by a dangerously irrelevant SO(2) breaking operator, which prevents the interpretation of the emergent pseudo-Goldstone boson as a dual photon. At the quantum phase transition, the model mimics some features of deconfined quantum criticality, but remains linearly confining. Deconfinement only sets in at high temperature.

View original: http://arxiv.org/abs/1303.6858