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Название: New Developments in the Eight Vertex Model II: Chains of Odd Length
Авторы: Fabricius K., McCoy B.M.
We study the transfer matrix of the 8 vertex model with an odd number of lattice sites N. For systems at the root of unity points η = mK/L with m odd the transfer matrix is known to satisfy the famous “TQ” equation where Q(v) is a specifically known matrix. We demonstrate that the location of the zeroes of this Q(v) matrix is qualitatively different from the case of even N and in particular they satisfy a previously unknown equation, which is more general than what is often called “Bethe’s equation.”