Abstract
We consider a lattice model of two complex scalar matter fields , under a constraint , minimally coupled to a compact gauge field, with an additional Berry-phase term. This model has been the origin of a large body of works addressing novel paradigms for quantum criticality, in particular “spin-quark” (spinon) deconfinement in quantum antiferromagnets. We map the model exactly onto a link-current model, which permits the use of classical worm algorithms to study the model in large-scale Monte Carlo simulations on lattices of size , up to . We show that the addition of a Berry-phase term to the lattice model completely suppresses the phase transition in the universality class of the model, such that the original spin system described by the compact gauge theory is always in the ordered phase. The link-current formulation of the model is useful in identifying the mechanism by which the phase transition from an ordered to a disordered state is suppressed.
2 More- Received 12 March 2013
DOI:https://doi.org/10.1103/PhysRevB.88.094412
©2013 American Physical Society