The square lattice Ising model on the rectangle III: Hankel and Toeplitz determinants
arXiv:2103.10776 · doi:10.1088/1751-8121/ac0983
Abstract
Based on the results obtained in [Hucht, J. Phys. A: Math. Theor. 50, 065201 (2017)], we show that the partition function of the anisotropic square lattice Ising model on the rectangle, with open boundary conditions in both directions, is given by the determinant of a Hankel matrix, that equivalently can be written as the Pfaffian of a skew-symmetric Toeplitz matrix. The independent matrix elements of both matrices are Fourier coefficients of a certain symbol function, which is given by the ratio of two characteristic polynomials. These polynomials are associated to the different directions of the system, encode the respective boundary conditions, and are directly related through the symmetry of the considered Ising model under exchange of the two directions. The results can be generalized to other boundary conditions and are well suited for the analysis of finite-size scaling functions in the critical scaling limit using Szegő's theorem.
39 pages, 4 color figures, see also arXiv:1609.01963 and arXiv:1701.08722, accepted for publication at J. Phys. A: Math. Theor
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