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cond-mat.stat-mech2000
Completing Bethe's equations at roots of unity
Klaus Fabricius, Barry M. McCoy
In a previous paper we demonstrated that Bethe's equations are not sufficient to specify the eigenvectors of the XXZ model at roots of unity for states where the Hamiltonian has de…
cond-mat.stat-mech2000
The sl_2 loop algebra symmetry of the six-vertex model at roots of unity
Tetsuo Deguchi, Klaus Fabricius, Barry M. McCoy
We demonstrate that the six vertex model (XXZ spin chain) with and has an invariance under the loop algebra of which produces a special set of de…