Spin operator matrix elements in the superintegrable chiral Potts quantum chain

Abstract

We derive spin operator matrix elements between general eigenstates of the superintegrable Z_N-symmetric chiral Potts quantum chain of finite length. Our starting point is the extended Onsager algebra recently proposed by R.Baxter. For each pair of spaces (Onsager sectors) of the irreducible representations of the Onsager algebra, we calculate the spin matrix elements between the eigenstates of the Hamiltonian of the quantum chain in factorized form, up to an overall scalar factor. This factor is known for the ground state Onsager sectors. For the matrix elements between the ground states of these sectors we perform the thermodynamic limit and obtain the formula for the order parameters. For the Ising quantum chain in a transverse field (N=2 case) the factorized form for the matrix elements coincides with the corresponding expressions obtained recently by the Separation of Variables Method.

24 pages, 1 figure

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• The tau_2-model and the chiral Potts model revisited: completeness of Bethe equations from Sklyanin's SOV method
• Spontaneous Magnetization of the Integrable Chiral Potts Model
• Some comments on developments in exact solutions in statistical mechanics since 1944
• Central extension of the reflection equations and an analog of Miki's formula
• Ising correlations and elliptic determinants
• Form factors of twist fields in the lattice Dirac theory