Exact Correlation Amplitude for the S=1/2 Heisenberg Antiferromagnetic Chain
Abstract
The exact amplitude for the asymptotic correlation function in the S=1/2 Heisenberg antiferromagnetic chain is determined: <Sa0 Sbr> goes to (-1)r deltaab(ln r)1/2/[(2 pi)3/2r]. The behaviour of the correlation functions for small xxz anisotropy and the form of finite-size corrections to the correlation function are also analysed.
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