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arxiv: cond-mat/0409611 · v2 · submitted 2004-09-23 · ❄️ cond-mat.stat-mech · hep-th· quant-ph

Entanglement entropy in the Lipkin-Meshkov-Glick model

J. I. Latorre , R. Orus , E. Rico , J. Vidal This is my paper
classification ❄️ cond-mat.stat-mech hep-thquant-ph
keywords entropyentanglementfieldlipkin-meshkov-glickmagneticmodelanalysisanalyze
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We analyze the entanglement entropy in the Lipkin-Meshkov-Glick model, which describes mutually interacting spins half embedded in a magnetic field. This entropy displays a singularity at the critical point that we study as a function of the interaction anisotropy, the magnetic field, and the system size. Results emerging from our analysis are surprisingly similar to those found for the one-dimensional XY chain.

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