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Recent numerical simulations with different techniques have all suggested theexistence of a continuous quantum phase transition between the Z2 topologicalspin liquid phase and a conventional Neel order. Motivated by these numericalprogresses, we propose a candidate theory for such Z2-Neel transition. We firstargue on general grounds that, for a SU(2) invariant system, this transitioncannot be interpreted as the condensation of spinons in the Z2 spin liquidphase. Then we propose that such Z2-Neel transition is driven by proliferatingthe bound state of the bosonic spinon and vison excitation of the Z2 spinliquid, i.e. the so called (e, m)-type excitation. Universal critical exponentsassociated with this exotic transition are computed using 1/N expansion. Thistheory predicts that at the Z2-Neel transition, there is an emergent quasi longrange power law correlation of columnar valence bond solid order parameter.

Exotic continuous quantum phase transition between Z2 topological spin liquid and Neel order