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Geometric clusters in the overlap of the Ising model (2306.06220v2)

Published 9 Jun 2023 in cond-mat.stat-mech and physics.comp-ph

Abstract: We study the percolation properties of geometrical clusters defined in the overlap space of two statistically independent replicas of a square-lattice Ising model that are simulated at the same temperature. In particular, we consider two distinct types of clusters in the overlap, which we dub soft- and hard-constraint clusters, and which are subsets of the regions of constant spin overlap. By means of Monte Carlo simulations and a finite-size scaling analysis we estimate the transition temperature as well as the set of critical exponents characterizing the percolation transitions undergone by these two cluster types. The results suggest that both soft- and hard-constraint clusters percolate at the critical temperature of the Ising model and their critical behavior is governed by the correlation-length exponent $\nu = 1$ found by Onsager. At the same time, they exhibit non-standard and distinct sets of exponents for the average cluster size and percolation strength.

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