Surface energy and elementary excitations of the XXZ spin chain with arbitrary boundary fields
arXiv:1901.01514 · doi:10.1088/1751-8121/ab2259
Abstract
The thermodynamic properties of the XXZ spin chain with integrable open boundary conditions at the gaped region (i.e., the anisotropic parameter $η$ being a real number) are investigated.It is shown that the contribution of the inhomogeneous term in the $T-Q$ relation of the ground state and elementary excited state can be neglected when the size of the system $N$ tends to infinity. The surface energy and elementary excitations induced by the unparallel boundary magnetic fields are obtained.
22 pages, 15 figures