Abstract
We consider the six-vertex model in an L-shaped domain of the square lattice, with domain wall boundary conditions. For free-fermion vertex weights the partition function can be expressed in terms of some Hankel determinant, or equivalently as a Coulomb gas with discrete measure and a non-polynomial potential with two hard walls. We use Coulomb gas methods to study the partition function in the thermodynamic limit. We obtain the free energy of the six-vertex model as a function of the parameters describing the geometry of the scaled L-shaped domain. Under variations of these parameters the system undergoes a third-order phase transition. The result can also be considered in the context of dimer models, for the perfect matchings of the Aztec diamond graph with a cut-off corner.
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Colomo, F., Pronko, A.G. Thermodynamics of the Six-Vertex Model in an L-Shaped Domain. Commun. Math. Phys. 339, 699–728 (2015). https://doi.org/10.1007/s00220-015-2406-9
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DOI: https://doi.org/10.1007/s00220-015-2406-9