The entropy of the six-vertex model with variety of different boundary conditions

Abstract

We study the dependence of entropy [per lattice site] of six-vertex model on boundary conditions. We start with lattices of finite size and then proceed to thermodynamic limit. We argue that the six-vertex model with periodic, anti-periodic and mixed boundary conditions produce the same free-energy in the thermodynamic limit. We have found fixed boundary conditions such that the entropy varies continously from zero to its value for periodic boundary condition. We have also shown that the physical quantities of the six-vertex model at the isotropic point does not change in the case of singular toroidal boundary.

arXiv comment49 pages, 10 figures, 3 tables, one section and one figure added

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• Boundary correlations for the six-vertex model with reflecting end boundary condition
• Arctic curve of the free-fermion six-vertex model with reflecting end boundary condition
• Breakdown of the thermodynamic limit in quantum spin and dimer models
• Unusual Coulomb phase physics in the arctic square ice