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- W2022993989 abstract "We study the ground-state spin correlations in the gapless incommensurate regime of a $S=1/2$ $mathrm{XXZ}$ chain and a two-leg antiferromagnetic ladder under a magnetic field, in which the gapless excitations form a Tomonaga-Luttinger (TL) liquid. We calculate numerically the two-spin correlation functions and the local magnetization in the two models using the density-matrix renormalization-group method. By fitting the numerical results for an open $mathrm{XXZ}$ chain of 100 spins to correlation functions of a Gaussian model, we determine the TL-liquid parameter K and the amplitudes of the correlation functions. The value of K estimated from the fits is in excellent agreement with the exact value obtained from the Bethe ansatz. We apply the same method to the open ladder consisting of 200 spins and determine the dependence of K on the magnetization M. The $Kensuremath{-}M$ relation changes drastically depending on the ratio of the coupling constants in the leg and rung directions. We also discuss implications of these results to experiments on the nuclear spin relaxation rate ${1/T}_{1}$ and dynamical spin structure factors." @default.
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- W2022993989 date "2001-03-15" @default.
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- W2022993989 title "Spin correlations in the two-leg antiferromagnetic ladder in a magnetic field" @default.
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- W2022993989 doi "https://doi.org/10.1103/physrevb.63.134438" @default.
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