XX and Ising limits in integral formulae for finite temperature correlation functions of the XXZ chain

May, 2005
16 pages
Published in:
  • Theor.Math.Phys. 146 (2006) 119-130,
  • Teor.Mat.Fiz. 146 (2006) 146-160
e-Print:

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Abstract:
We consider a multiple integral representation for a one-parameter generating function of the finite temperature SzS^z-SzS^z 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.
  • 75.10.Pq
  • 05.30.-d
  • quantum spin chain
  • exact finite-temperature correlation functions
  • XX model