Factorized finite-size Ising model spin matrix elements from separation of variables
G von Gehlen, N Iorgov, S Pakuliak, V Shadura · Journal of Physics A Mathematical and Theoretical · 2009
Using the Sklyanin-Kharchev-Lebedev method of Separation of Variables adapted to the cyclic Baxter--Bazhanov--Stroganov or $\tau^{(2)}$-model, we derive factorized formulae for general finite-size Ising model spin matrix elements, proving a recent conjecture by Bugrij and Lisovyy.