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Partition Function Zeros of a Restricted Potts Model on Self-Dual Strips of the Square Lattice

Shu-Chiuan Chang·Robert Shrock
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Abstract

We calculate the partition function $Z(G,Q,v)$ of the $Q$-state Potts model exactly for self-dual cyclic square-lattice strips of various widths $L_y$ and arbitrarily great lengths $L_x$, with $Q$ and $v$ restricted to satisfy the relation $Q=v^2$. From these calculations, in the limit $L_x \to \infty$, we determine the continuous accumulation locus ${\cal B}$ of the partition function zeros in the $v$ and $Q$ planes. A number of interesting features of this locus are discussed and a conjecture is given for properties applicable for arbitrarily great width. Relations with the loci ${\cal B}$ for general $Q$ and $v$ are analyzed.

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Shu-Chiuan Chang, Robert Shrock. 2006-02-07. Partition Function Zeros of a Restricted Potts Model on Self-Dual Strips of the Square Lattice. https://doi.org/10.1142/s021797920703703x

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