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Phase diagram of the square-lattice three-state Potts antiferromagnet with a staggered polarization field
1Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
Abstract:
We study a square-lattice three-state Potts antiferromagnet with a staggered polarization field at finite temperature. Numerically treating the transfer matrices, we determine two phase boundaries separating the model-parameter space into three parts. We confirm that one of them belongs to the ferromagnetic three-state Potts criticality, which is in accord with a recent prediction, and another to the Ising-type; these are both corresponding to the massless renormalization-group flows stemming from the Gaussian fixed points. We also discuss a field theory to describe the latter Ising transition.
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