Correlations and order parameter at a Coulomb-crystal phase transition in a three-dimensional dimer model

Abstract

The three-dimensional classical dimer model with interactions shows an unexpected continuous phase transition between an ordered dimer crystal and a Coulomb liquid. A detailed analysis of the critical dimer and monomer correlation functions point to a subtle interplay between the fluctuations of the crystal order parameter and the "magnetic" degrees of freedom present in the Coulomb phase. The distribution probability of the crystal order parameter suggests an emerging continuous O(3) symmetry at the critical point.

4 pages, 4 color figures. v2: published version. New data & figure on the probability distribution of the crystal order parameter close to Tc

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