Thermal form factors of the XXZ chain and the large-distance asymptotics of its temperature dependent correlation functions

@article{Dugave2013ThermalFF,
  title={Thermal form factors of the XXZ chain and the large-distance asymptotics of its temperature dependent correlation functions},
  author={Maxime Dugave and Frank Gohmann and Karol K. Kozlowski},
  journal={Journal of Statistical Mechanics: Theory and Experiment},
  year={2013},
  volume={2013},
  pages={07010}
}
We derive expressions for the form factors of the quantum transfer matrix of the spin- XXZ chain which are suitable for taking the infinite Trotter number limit. These form factors determine the finitely many amplitudes in the leading asymptotics of the finite-temperature correlation functions of the model. We consider form factor expansions of the longitudinal and transversal two-point functions. Remarkably, the formulae for the amplitudes are in both cases of the same form. We also explain… 

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