Exact Potts Model Partition Functions for Strips of the Triangular Lattice

Details Exact Potts Model Partition Functions for Strips of the Triangular Lattice Exact Potts Model Partition Functions for Strips of the Triangular Lattice

2002-11-27

arxiv.org/abs/cond-mat/0211623v2

J. Stat. Phys. 114 (2004) 763-823

Physics

Condensed Matter

Statistical Mechanics

59 pages, LaTeX2e. Self-unpacking archive containing the tex file, three sty files, 51 ps files, and a gziped Mathematica file

Scientific paper

We present exact calculations of the Potts model partition function Z(G,q,v) for arbitrary q and temperature-like variable v on n-vertex strip graphs G of the triangular lattice for a variety of transverse widths equal to L vertices and for arbitrarily great length equal to m vertices, with free longitudinal boundary conditions and free and periodic transverse boundary conditions. These have the form Z(G,q,v)=\sum_{j=1}^{N_{Z,G,\lambda}} c_{Z,G,j}(\lambda_{Z,G,j})^{m-1}. We give general formulas for N_{Z,G,j} and its specialization to v=-1 for arbitrary L. The free energy is calculated exactly for the infinite-length limit of the graphs, and the thermodynamics is discussed. It is shown how the internal energy calculated for the case of cylindrical boundary conditions is connected with critical quantities for the Potts model on the infinite triangular lattice. Considering the full generalization to arbitrary complex q and v, we determine the singular locus {\cal B}, arising as the accumulation set of partition function zeros as m\to\infty, in the q plane for fixed v and in the v plane for fixed q.

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