Entanglement entropy in the Lipkin-Meshkov-Glick model
arXiv:cond-mat/0409611 · doi:10.1103/PhysRevA.71.064101
Abstract
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.
5 pages, 5 figures, published version