2D Potts Model Correlation Lengths: Numerical Evidence for ξo = ξd at βt
Wolfhard Janke, Stefan Kappler
Abstract
We have studied spin-spin correlation functions in the ordered phase of the two-dimensional q-state Potts model with q=10, 15, and 20 at the first-order transition point βt. Through extensive Monte Carlo simulations we obtain strong numerical evidence that the correlation length in the ordered phase agrees with the exactly known and recently numerically confirmed correlation length in the disordered phase: ξo(βt) = ξd(βt). As a byproduct we find the energy moments in the ordered phase at βt in very good agreement with a recent large q-expansion.
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