Geometrical aspects of the Z-invariant Ising model

Details Geometrical aspects of the Z-invariant Ising model Geometrical aspects of the Z-invariant Ising model

2004-01-22

arxiv.org/abs/cond-mat/0401408v1

Physics

Condensed Matter

Statistical Mechanics

15 pages, eps figures included

Scientific paper

We discuss a geometrical interpretation of the Z-invariant Ising model in terms of isoradial embeddings of planar lattices. The Z-invariant Ising model can be defined on an arbitrary planar lattice if and only if certain paths on the lattice edges do not intersect each other more than once or self-intersect. This topological constraint is equivalent to the existence of isoradial embeddings of the lattice. Such embeddings are characterized by angles which can be related to the model coupling constants in the spirit of Baxter's geometrical solution. The Ising model on isoradial embeddings studied recently by several authors in the context of discrete holomorphy corresponds to the critical point of this particular Z-invariant Ising model.

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