Abstract
A periodic Ising model has interactions which are invariant under translations of a full-rank sublattice \({\mathfrak{L}}\) of \({\mathbb{Z}^2}\). We prove an exact, quantitative characterization of the critical temperature, defined as the supremum of temperatures for which the spontaneous magnetization is strictly positive. For the ferromagnetic model, the critical temperature is the solution of a certain algebraic equation, resulting from the condition that the spectral curve of the corresponding dimer model on the Fisher graph has a real zero on the unit torus. With our technique we provide a simple proof for the exponential decay of spin-spin correlations above the critical temperature, as well as the exponential decay of the edge-edge correlations for all non-critical edge weights of the corresponding dimer model on periodic Fisher graphs.
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Li, Z. Critical Temperature of Periodic Ising Models. Commun. Math. Phys. 315, 337–381 (2012). https://doi.org/10.1007/s00220-012-1571-3
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DOI: https://doi.org/10.1007/s00220-012-1571-3