Polynomial solutions of qKZ equation and ground state of XXZ spin chain at Delta = -1/2

Abstract

Integral formulae for polynomial solutions of the quantum Knizhnik-Zamolodchikov equations associated with the R-matrix of the six-vertex model are considered. It is proved that when the deformation parameter q is equal to e^{+- 2 pi i/3} and the number of vertical lines of the lattice is odd, the solution under consideration is an eigenvector of the inhomogeneous transfer matrix of the six-vertex model. In the homogeneous limit it is a ground state eigenvector of the antiferromagnetic XXZ spin chain with the anisotropy parameter Delta equal to -1/2 and odd number of sites. The obtained integral representations for the components of this eigenvector allow to prove some conjectures on its properties formulated earlier. A new statement relating the ground state components of XXZ spin chains and Temperley-Lieb loop models is formulated and proved.

v2: cosmetic changes, new section on refined TSSCPPs vs refined ASMs

References in corpus (2)

• The eight-vertex model and Painleve VI
• Bethe roots and refined enumeration of alternating-sign matrices

Cited by in corpus (1)

• On some ground state components of the O(1) loop model