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Quantum criticality and deconfinement in phase transitions between valence bond solids

Quantum criticality and deconfinement in phase transitions between valence bond solids

We consider spin-half quantum antiferromagnets in two spatial dimensions in the quantum limit, where the spins are in a valence bond solid (VBS) phase. The transition between two such VBS phases is studied. In some cases, an interesting second-order transition controlled by a fixed line with varying critical exponents is …