Entanglement entropy in the Lipkin-Meshkov-Glick model

Details Entanglement entropy in the Lipkin-Meshkov-Glick model Entanglement entropy in the Lipkin-Meshkov-Glick model

2004-09-23

arxiv.org/abs/cond-mat/0409611v2

Phys. Rev. A 71, 064101 (2005)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 5 figures, published version

Scientific paper

10.1103/PhysRevA.71.064101

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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