NUMERICAL TECHNIQUES FOR INVESTIGATING AN EXCITED-STATE OF THE ANISOTROPIC HEISENBERG-MODEL

An analysis of the anisotropic Heisenberg model is carried out by solv ing the Bethe ansatz solution of the model numerically as a function o f finite N. A brief introduction to the infinite chain limit is presen ted and the energy for a few limiting cases of the anisotropy paramete r are evaluated. Numerical results for the infinite chain are given wh ich can be compared with the case of finite increasing N. It is shown that the calculation can be extended to the case of an excited state o f the model.