Phase diagram of the three states Potts model with next nearest neighbor interactions on the Bethe lattice

Abstract

We have found an exact phase diagram of the Potts model with next nearest neighbor interactions on the Bethe lattice of order two. The diagram consists of five phases: ferromagnetic, paramagnetic, modulated, antiphase and paramodulated, all meeting at the Lifshitz point i.e. $p=1/3$. We report on a new phase which we denote as paramodulated, found at low temperatures and characterized by 2-periodic points of an one dimensional dynamical system lying inside the modulated phase. Such a phase, inherent in the Potts model has no analogues in the Ising setting.

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• Phase transitions in the Potts model on complex networks
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• Next nearest neighbour Ising models on random graphs
• Phase diagrams of lattice models on Cayley tree and chandelier network: a review
• Exact solution of a generalized ANNNI model on a Cayley tree