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 The Bethe ansatz for the six-vertex and XXZ models: An exposition
 Hugo Duminil-Copin, I.H.E.S. and University of GenevaMaxime Gagnebin, University of GenevaMatan Harel, University of GenevaIoan Manolescu, University of FribourgVincent Tassion, ETH Zurich

 Abstract In this paper, we review a few known facts on the coordinate Bethe ansatz. We present a detailed construction of the Bethe ansatz vector $$\psi$$ and energy $$\Lambda$$, which satisfy $$V \psi = \Lambda \psi$$, where $$V$$ is the transfer matrix of the six-vertex model on a finite square lattice with periodic boundary conditions for weights $$a= b=1$$ and $$c > 0$$. We also show that the same vector $$\psi$$ satisfies $$H \psi = E \psi$$, where $$H$$ is the Hamiltonian of the XXZ model (which is the model for which the Bethe ansatz was first developed), with a value $$E$$ computed explicitly. Variants of this approach have become central techniques for the study of exactly solvable statistical mechanics models in both the physics and mathematics communities. Our aim in this paper is to provide a pedagogically-minded exposition of this construction, aimed at a mathematical audience. It also provides the opportunity to introduce the notation and framework which will be used in a subsequent paper by the authors [5] that amounts to proving that the random-cluster model on $$\mathbb{Z}^{2}$$ with cluster weight $$q >4$$ exhibits a first-order phase transition. AMS 2000 subject classifications: 60K35, 82B20, 82B23, 82B26.Keywords: Transfer matrix, Bethe ansatz, six vertex model, XXZ model.
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Duminil-Copin, Hugo, Gagnebin, Maxime, Harel, Matan, Manolescu, Ioan, Tassion, Vincent, The Bethe ansatz for the six-vertex and XXZ models: An exposition, Probability Surveys, 15, (2018), 102-130 (electronic). DOI: 10.1214/17-PS292.

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