paper

Complex-Temperature Properties of the Ising Model on 2D Heteropolygonal Lattices

arXiv:hep-lat/9503005 · doi:10.1088/0305-4470/28/18/014

Abstract

Using exact results, we determine the complex-temperature phase diagrams of the 2D Ising model on three regular heteropolygonal lattices, (kagomé), , and (bathroom tile), where the notation denotes the regular -sided polygons adjacent to each vertex. We also work out the exact complex-temperature singularities of the spontaneous magnetisation. A comparison with the properties on the square, triangular, and hexagonal lattices is given. In particular, we find the first case where, even for isotropic spin-spin exchange couplings, the nontrivial non-analyticities of the free energy of the Ising model lie in a two-dimensional, rather than one-dimensional, algebraic variety in the plane.

31 pages, latex, postscript figures

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