Evaluation parameters and Bethe roots for the six vertex model at roots of unity

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We propose an expression for the current form of the lowering operator of the sl₂ loop algebra symmetry of the six vertex model (XXZ spin chain) at roots of unity. This operator has poles which correspond to the evaluation parameters of representation theory which are given as the roots of the Drinfeld polynomial. We explicitly compute these polynomials in terms of the Bethe roots which characterize the highest weight states for all values of Sᶻ. From these polynomials we find that the Bethe roots satisfy sum rules for each value of Sᶻ.