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Exact correlation amplitude for the Heisenberg antiferromagnetic chain

1998; Institute of Physics; Volume: 31; Issue: 20 Linguagem: Inglês

10.1088/0305-4470/31/20/002

1361-6447

Ian Affleck,

Algebraic structures and combinatorial models

The exact amplitude for the asymptotic correlation function in the S=1/2 Heisenberg antiferromagnetic chain is determined: goes to (-1)^r delta^{ab}(ln r)^{1/2}/[(2 pi)^{3/2}r]. The behaviour of the correlation functions for small xxz anisotropy and the form of finite-size corrections to the correlation function are also analysed.