%0 Journal Article
%T Small polaron with generic open boundary conditions revisit: exact solution via the off-diagonal Bethe ansatz
%A Xiaotian Xu
%A Junpeng Cao
%A Kun Hao
%A Zhan-Ying Yang
%A Wen-Li Yang
%J Physics
%D 2015
%I arXiv
%R 10.1016/j.nuclphysb.2015.07.008
%X The small polaron, an one-dimensional lattice model of interacting spinless fermions, with generic non-diagonal boundary terms is studied by the off-diagonal Bethe ansatz method. The presence of the Grassmann valued non-diagonal boundary fields gives rise to a typical $U(1)$-symmetry-broken fermionic model. The exact spectra of the Hamiltonian and the associated Bethe ansatz equations are derived by constructing an inhomogeneous $T-Q$ relation.
%U http://arxiv.org/abs/1504.00207v2