Boson pairing and unusual criticality in a generalized XY model

Details Boson pairing and unusual criticality in a generalized XY model Boson pairing and unusual criticality in a generalized XY model

2011-08-29

arxiv.org/abs/1108.5744v2

Phys. Rev. Lett. 107, 240601 (2011)

Physics

Condensed Matter

Statistical Mechanics

Published version

Scientific paper

We discuss the unusual critical behavior of a generalized XY model containing both 2\pi-periodic and \pi-periodic couplings between sites. The presence of vortices and half-vortices allows for single-particle condensate and pair-condensate phases. Using a field theoretic formulation and worm algorithm Monte Carlo simulations, we show that in two dimensions it is possible for the system to pass directly from the disordered (high temperature) phase to the single particle (quasi)-condensate via an Ising transition, a situation reminiscent of the `deconfined criticality' scenario.

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