Out of equilibrium correlation functions of quantum anisotropic XY models: oneparticle excitations
Abstract
We calculate exactly matrix elements between nonequilibrium excitations of the quantum XY model for general anisotropy. These matrix elements are expressed as a sum of Pfaffians. For single particle excitations on the ground state, the Pfaffians in the sum simplify to determinants.
 Publication:

Journal of Physics A Mathematical General
 Pub Date:
 January 2004
 DOI:
 10.1088/03054470/37/2/001
 arXiv:
 arXiv:condmat/0306285
 Bibcode:
 2004JPhA...37..291A
 Keywords:

 Condensed Matter  Strongly Correlated Electrons;
 High Energy Physics  Theory;
 Mathematical Physics;
 Mathematics  Mathematical Physics;
 Nonlinear Sciences  Exactly Solvable and Integrable Systems
 EPrint:
 11 pages, no figures