Fully packed loop models on finite geometries

Details Fully packed loop models on finite geometries Fully packed loop models on finite geometries

2009-01-26

arxiv.org/abs/0901.3963v1

Polygons, polyominoes and polycubes, Lecture Notes in Physics 775 (2009), ed. A.J. Guttmann, Ch. 13

Physics

Condensed Matter

Statistical Mechanics

30 pages, contributed chapter

Scientific paper

Fully packed loop models describe the statistics of closely packed nested polygons on the square lattice. Many exact results can be obtained for these models, even for finite geometries, using their close relationship to alternating-sign matrices and the solvable six-vertex and O(n=1) lattice models. Some results for the exact partition function of fully packed loop models on various finite geometries are briefly reviewed, as well as the well-known order-disorder bulk phase transition present in these models. A detailed study is presented of the distribution of boundary nests of polygons in fully packed loop models with mirror or rotational symmetry. The probability distribution function of such nests, as well as the average number of nests, are obtained analytically, albeit conjecturally. It is further shown that fully packed loop models undergo another phase transition as a function of the boundary nest fugacity. At criticality, we derive a scaling form for the nest distribution function which displays an unusual non-Gaussian cubic exponential behaviour.

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