XX and Ising limits in integral formulae for finite temperature correlation functions of the XXZ chain
Frank Göhmann, Alexander Seel
Abstract
We consider a multiple integral representation for a one-parameter generating function of the finite temperature Sz-Sz correlation functions of the antiferromagnetic spin-1/2 XXZ chain in the XX limit and in the Ising limit. We show how in these limits the multiple integrals reduce to single integrals, thereby reproducing known results.
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