2005/08/27 by Zhe Sun, Xiaoguang Wang, XiaoGuang Wang +4
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum many-body systems #quant-ph
paper · pdf · doi:10.1016/j.physa.2006.03.020
published as Physica A: Statistical and Theoretical Physics, Volume 370, Issue 2, Pages 483-500 (2005) · 11 pages, 12 figures
arxiv created 2005/08/27 · openalex publication_date 2006/05/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
By using the concept of negativity, we investigate entanglement in (1/2,1) mixed-spin Heisenberg systems. We obtain the analytical results of entanglement in small isotropic Heisenberg clusters with only nearest-neighbor (NN) interactions up to four spins and in the four-spin Heisenberg model with both NN and next-nearest-neighbor (NNN) interactions. For more spins, we numerically study effects of temperature, magnetic fields, and NNN interactions on entanglement. We study in detail the threshold value of the temperature, after which the negativity vanishes.