Entanglement perturbation theory for the elementary excitation in one dimension
Abstract
The entanglement perturbation theory is developed to calculate the excitation spectrum in one dimension. Applied to the spin-12 antiferromagnetic Heisenberg model, it reproduces the des Cloiseaux-Pearson Bethe ansatz result. As for spin-1, the spin-triplet magnon spectrum has been determined for the first time for the entire Brillouin zone, including the Haldane gap at k=π.
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