Exact solution of close-packed dimers on the kagome lattice

Details Exact solution of close-packed dimers on the kagome lattice Exact solution of close-packed dimers on the kagome lattice

2006-12-21

arxiv.org/abs/cond-mat/0612573v2

Phys. Rev. E 75, 040105R (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, RevTex4, two column, published version, removed section of asymmetric model, added details about dimer cor

Scientific paper

10.1103/PhysRevE.75.040105

It is well-known that exact enumerations of close-packed dimers can be carried out for two-dimensional lattices. While details of results are now known for most lattices, due to the unique nature of the lattice structure, there has been no complete analysis for the kagome lattice. Here we derive the close-form expression $(1/3) \ln (4 x y z)$ for the free energy of close-packed dimers on the kagome lattice, where $x,y,z$ are dimer weights. We use two different approaches, the Kasteleyn method of evaluating a Pfaffian and an alternative vertex model formulation. Both methods lead to the same final expression. The correlation function between two dimers at a distance equal or greater than two lattice spacings is found to vanish identically.

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