Integral representation of the density matrix of the XXZ chain at finite temperatures
Abstract
We present an integral formula for the density matrix of a finite segment of the infinitely long spin-\frac{1}{2} XXZ chain. This formula is valid for any temperature and any longitudinal magnetic field.
- Publication:
-
Journal of Physics A Mathematical General
- Pub Date:
- March 2005
- DOI:
- arXiv:
- arXiv:cond-mat/0412062
- Bibcode:
- 2005JPhA...38.1833G
- Keywords:
-
- Condensed Matter - Statistical Mechanics;
- High Energy Physics - Theory
- E-Print:
- 12 pages, Latex