paper

Logarithmic divergence of the block entanglement entropy for the ferromagnetic Heisenberg model

arXiv:quant-ph/0404026 · doi:10.1103/PhysRevA.71.012301

Abstract

Recent studies have shown that logarithmic divergence of entanglement entropy as function of size of a subsystem is a signature of criticality in quantum models. We demonstrate that the ground state entanglement entropy of sites for ferromagnetic Heisenberg spin-1/2 chain of the length in a sector with fixed magnetization per site grows as , where

4 pages, 2 figs

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