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Entanglement in the quantum one-dimensional integer spin S Heisenberg antiferromagnet

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  • Lima, L.S.

Abstract

We use the modified spin wave theory of Takahashi to study the entanglement entropy in the quantum one-dimensional integer spin Heisenberg antiferromagnet. We calculate the entanglement entropy of this spin system that is well known to be a quantum wire, in the classical limit (N→∞). We obtain a decreasing the entanglement entropy with the temperature and we obtain none change in the entanglement in the point Δ=1 at T=0 where the system presents a quantum phase transition from a gapless phase in the spectrum Δ<1 to a gapped phase Δ≥1.

Suggested Citation

  • Lima, L.S., 2017. "Entanglement in the quantum one-dimensional integer spin S Heisenberg antiferromagnet," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 483(C), pages 239-242.
    • Handle: RePEc:eee:phsmap:v:483:y:2017:i:c:p:239-242
    DOI: 10.1016/j.physa.2017.04.179
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    Keywords

    Entropy; Entanglement;

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