Corner contribution to cluster numbers in the Potts model

Kovács, István and Elci, E. M. and Weigel, M. and Iglói, Ferenc (2014) Corner contribution to cluster numbers in the Potts model. PHYSICAL REVIEW B, 89 (6). ISSN 2469-9950

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Abstract

For the two-dimensional Q-state Potts model at criticality, we consider Fortuin-Kasteleyn and spin clusters and study the average number NΓ of clusters that intersect a given contour Γ. To leading order, NΓ is proportional to the length of the curve. Additionally, however, there occur logarithmic contributions related to the corners of Γ. These are found to be universal and their size can be calculated employing techniques from conformal field theory. For the Fortuin-Kasteleyn clusters relevant to the thermal phase transition we find agreement with these predictions from large-scale numerical simulations. For the spin clusters, on the other hand, the cluster numbers are not found to be consistent with the values obtained by analytic continuation, as conventionally assumed.

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