The Thermodynamical Limit of the Lipkin-Meshkov-Glick Model
arXiv:cond-mat/0703490 · doi:10.1103/PhysRevLett.99.050402
Abstract
A method based on the analyzis of the Majorana polynomial roots is introduced to compute the spectrum of the Lipkin-Meshkov-Glick model in the thermodynamical limit. A rich structure made of four qualitatively different regions is revealed in the parameter space whereas the ground state study only distinguishes between two phases.
4 pages, 3 figures, published version