Correlation amplitude for S=1/2 XXZ spin chain in the critical region

Details Correlation amplitude for S=1/2 XXZ spin chain in the critical region Correlation amplitude for S=1/2 XXZ spin chain in the critical region

1998-03-13

arxiv.org/abs/cond-mat/9803159v3

Phys. Rev. B 58 (1998) R583

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures, final version

Scientific paper

10.1103/PhysRevB.58.R583

The density-matrix renormalization-group technique is used to calculate the spin correlation functions and of the one-dimensional S=1/2 XXZ model in the gapless regime. The numerical results for open chains of 200 spins are analyzed by comparing them with correlation functions calculated from a low-energy field theory. This gives precise estimates of the amplitudes of the correlation functions in the thermodynamic limit. The exact amplitude recently conjectured by Lukyanov and Zamolodchikov and the logarithmic correction in the Heisenberg model are confirmed numerically.

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