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Quantum Hall bilayer phase diagram with respect to interlayer distance bearsa remarkable similarity with phase diagrams of strongly correlated systems as afunction of doping, with magnetic ordering on the one end and Fermi-liquid-likebehaviour on the other. Moreover, it has been suggested [PRL 101, 176803(2008)] that a BCS correlated state of composite fermions with p-wave pairingmay exist in the intermediate region. In the same region, an exactdiagonalization study in the torus geometry [PRB 69, 045319 (2004)] pointed outthe existence of state(s) with pseudospin spiraling order. Here we reconcilethese two descriptions of the intermediate state by considering the underlyingbosonic representation of the composite fermion paired state in the longdistance limit, and by performing extensive exact diagonalizations on thetorus. We argue that the spiraling states belong to the manifold of degenerateground state(s), and are a consequence of Bose condensation of thequasiparticles (with critical algebraic correlations) at non-zero momenta inthe two pseudospin states. The spiraling states, generated in this way asspin-textures, can be identified with meron-antimeron constructions. Thus,merons -- the fractionally charged vortex excitations of the XY magneticallyordered state -- constitute some of the topological sectors. It follows thatmerons are deconfined in the intermediate state, and allow for a smoothtransition between the magnetically ordered and Fermi-liquid-like phases, inwhich they are bound in pairs.

Meron deconfinement in the quantum Hall bilayer at intermediate distances