Bethe Ansatz solution of the small polaron with nondiagonal boundary terms

Understand

The small polaron with generic, nondiagonal boundary terms is investigated within the framework of quantum integrability.

• The fusion hierarchy of the transfer matrices and its truncation for particular values of the anisotropy parameter are both employed, so that the spectral problem is formulated in terms of a TQ equation.
• The solution of this equation for generic boundary conditions is based on a deformation of the diagonal case.
• The eigenvalues of the model are extracted and the corresponding Bethe Ansatz equations are presented.