The Effective Bethe Ansatz approximates ground and first excited states of the spin-1 bilinear-biquadratic chain in finite windows around both integrable endpoints, with fidelity to exact diagonalization degrading controllably and entanglement entropy reproduced poorly.
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Effective Bethe Ansatz for Spin-1 Non-integrable Models
The Effective Bethe Ansatz approximates ground and first excited states of the spin-1 bilinear-biquadratic chain in finite windows around both integrable endpoints, with fidelity to exact diagonalization degrading controllably and entanglement entropy reproduced poorly.