2011/11/18 by PR Wells, P. R. Wells Jr., Wells, P. R. +3 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Quantum Physics (quant-ph) #Quantum many-body systems #Theoretical and Computational Physics #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.48550/arxiv.1111.4513
8 pages, 7 figures
arxiv created 2011/11/18 · openalex publication_date 2011/11/18 · arxiv updated 2015/03/19 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
We investigate pairwise correlation properties of the ground state (GS) of finite antiferromagnetic (AFM) spin chains described by the Heisenberg model. The exchange coupling is restricted to nearest neighbor spins, and is constant J0 except for a pair of neighboring sites, where the coupling J1 may vary. We identify a rich variety of possible behaviors for different measures of pairwise (quantum and classical) correlations and entanglement in the GS of such spin chain. Varying a single coupling affects the degree of correlation between all spin pairs, indicating possible control over such correlations by tuning J1. We also show that a class of two spin states constitutes exact spin realizations of Werner states (WS). Apart from the basic and theoretical aspects, this opens concrete alternatives for experimentally probing non-classical correlations in condensed matter systems, as well as for experimental realizations of a WS via a single tunable exchange coupling in a AFM chain.