Integral representation of the density matrix of the XXZ chain at finite temperatures

Dec, 2004
12 pages
Published in:
  • J.Phys.A 38 (2005) 1833-1842
e-Print:

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Abstract: (arXiv)
We present an integral formula for the density matrix of a finite segment of the infinitely long spin-1/2 XXZ chain. This formula is valid for any temperature and any longitudinal magnetic field.
Note:
  • 12 pages, Latex Subj-class: Statistical Mechanics
  • 75.10.Pq
  • 05.30.-d