Form-factors in the Baxter–Bazhanov–Stroganov model II: Ising model on the finite lattice
G von Gehlen, N. Z. Iorgov, S Pakuliak +2 more
We continue our investigation of the Baxter-Bazhanov-Stroganov or τ^{(2)}-model using the method of separation of variables [nlin/0603028,arXiv:0708.4342]. In this paper we derive for the first time the factorized formula for form-factors of the Ising model on a finite lattice conjectured previously by A.Bugrij and O.Lisovyy in [arXiv:0708.3625,arXiv:0708.3643]. We also find the matrix elements of the spin operator for the finite quantum Ising chain in a transverse field.
arXiv:0711.0457•Journal of Physics A Mathematical and Theoretical•Feb 19, 2008•50 citations