Intersecting Loop Models on Z^D: Rigorous Results

Details Intersecting Loop Models on Z^D: Rigorous Results Intersecting Loop Models on Z^D: Rigorous Results

1999-10-20

arxiv.org/abs/cond-mat/9910292v2

Nucl. Phys. B, 570, 590-614, (2000)

Physics

Condensed Matter

Statistical Mechanics

LaTeX+elsart.cls; 30 p., 6 figs; submitted to Nucl. Phys. B; a few minor typos corrected

Scientific paper

10.1016/S0550-3213(99)00780-4

We consider a general class of (intersecting) loop models in D dimensions, including those related to high-temperature expansions of well-known spin models. We find that the loop models exhibit some interesting features - often in the ``unphysical'' region of parameter space where all connection with the original spin Hamiltonian is apparently lost. For a particular n=2, D=2 model, we establish the existence of a phase transition, possibly associated with divergent loops. However, for n >> 1 and arbitrary D there is no phase transition marked by the appearance of large loops. Furthermore, at least for D=2 (and n large) we find a phase transition characterised by broken translational symmetry.

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