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Equal-time temperature correlators of the one-dimensional Heisenberg XY chain

A. G. Izergin·V. S. Kapitonov·N. A. Kitanine
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Abstract

Representations as determinants of $M\times M$ dimensional matrices are obtained for equal-time temperature correlators of the anisotropic Heisenberg XY chain. These representations are simple deformations of the answers for the isotropic XX0 chain. In the thermodynamic limit, the correlators are expressed in terms of the Fredholm determinants of linear integral operators.

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A. G. Izergin, V. S. Kapitonov, N. A. Kitanine. 1997-10-30. Equal-time temperature correlators of the one-dimensional Heisenberg XY chain. https://arxiv.org/abs/solv-int/9710028

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