The open spin chain with impurity: an exact solution
Holger Frahm, Andrei A. Zvyagin
Using a model of an open spin chain that is exactly soluble by means of a Bethe ansatz , we study the effects of a boundary magnetic field and an impurity spin coupled to the chain. An impurity spin only scatters forward, while the boundary is purely a back-scatterer. Two parameters for the impurity and one for the boundary permit us to mimic the effect of real magnetic impurity, with both forward and backward scattering.
Journal of Physics Condensed Matter•Nov 10, 1997•83 citations