PMID: 17155781Dec 13, 2006Paper

Entanglement entropy beyond the free case

Physical Review Letters
Thomas BarthelJulien Vidal


We present a perturbative method to compute the ground state entanglement entropy for interacting systems. We apply it to a collective model of mutually interacting spins in a magnetic field. At the quantum critical point, the entanglement entropy scales logarithmically with the subsystem size, the system size, and the anisotropy parameter. We determine the corresponding scaling prefactors and evaluate the leading finite-size correction to the entropy. Our analytical predictions are in perfect agreement with numerical results.


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Apr 20, 2004·Physical Review Letters·V E Korepin
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Feb 9, 2005·Physical Review Letters·G Refael, J E Moore
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