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Completeness of the Bethe ansatz for the periodic isotropic Heisenberg model. (English) Zbl 1434.82030

In this article the author studies the completeness of the Bethe ansatz for a periodic isotropic Heisenberg spin chain with arbitrary spins and inhomogeneities. The author provides a system of algebraic equations whose solutions are in bijection with the eigenvalues of the transfer matrix of the chain. The system describes pairs of polynomials with given discrete Wronskian. In this way, the author shows that the spectrum of the transfer matrix is necessarily simple modulo natural degeneration.
Reprint of [V. Tarasov, in: Ludwig Faddeev memorial volume. A life in mathematical physics. Hackensack, NJ: World Scientific. 549–566 (2018; Zbl 1397.82019)].

MSC:

82B23 Exactly solvable models; Bethe ansatz
82D40 Statistical mechanics of magnetic materials

Citations:

Zbl 1397.82019
Full Text: DOI

References:

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