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Impurity spin relaxation inS=12XXchains
Physical Review B (Condensed Matter)
Dynamic autocorrelations (α=x,z) of an isolated impurity spin in a S=1/2 XX chain are calculated. The impurity spin, defined by a local change in the nearest-neighbor coupling, is either in the bulk or at the boundary of the open-ended chain. The exact numerical calculation of the correlations employs the Jordan-Wigner mapping from spin operators to Fermi operators; effects of finite system size can be eliminated. Two distinct temperature regimes are observed in the long-time asymptoticdoi:10.1103/physrevb.61.4026 fatcat:npadtxitcjdxhnwtginalndcsa