Exact real-time longitudinal correlation functions of the massive XXZ chain
Abstract
We apply the recently developed thermal form factor expansion method to evaluate the real-time longitudinal spin-spin correlation functions of the spin-12 XXZ chain in the antiferromagnetically ordered regime at temperature T=0. An analytical result containing all types of excitations in the model is obtained, without any approximations. This allows for the accurate calculation of the real-time correlation functions in this strongly interacting quantum system for arbitrary distances and times.
0