Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-01-25
Physics
Condensed Matter
Statistical Mechanics
This paper has been rewritten as the following three separate articles: cond-mat/0503192, cond-mat/0607513 and 0801.0186
Scientific paper
The structures of the configuration space of the six-vertex models with various boundaries and boundary conditions are investigated, and it is derived that the free energies depend on the boundary conditions, and that they are classified by the fractal structures. The "n-equivalences" of the boundary conditions are defined with a property that the models with n-equivalent boundary conditions result in the identical free energy. The configurations which satisfy the six-vertex restriction are classified, through the n-equivalences, into sets of configurations called islands. It is derived that each island shows a fractal structure when it is mapped to the real axis. Each free energy is expressed by the weighted fractal dimension (multi-fractal dimension) of the island. The fractal dimension of the island has a strict relation with the maximum eigenvalue of the corresponding block element of the transfer matrix. It is also found that the fractal dimensions of islands take the absolute maximum when the boundary is "alternative"; in this case, the free energy equals to the solution obtained by Lieb and Sutherland.
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