Abstract
We study the perturbation theory for the general nonintegrable chiral Potts model depending on two chiral angles and a strength parameter and show how the analyticity of the ground-state energy and correlation functions dramatically increases when the angles and the strength parameter satisfy the integrability condition. We further specialize to the superintegrable case and verify that a sum rule is obeyed.
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McCoy, B.M., Orrick, W.P. Analyticity and integrability in the chiral Potts model. J Stat Phys 83, 839–865 (1996). https://doi.org/10.1007/BF02179547
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DOI: https://doi.org/10.1007/BF02179547