Exact solutions and elementary excitations in the XXZ spin chain with unparallel boundary fields
Cao, Junpeng · Lin, Hai-Qing · Shi, Kang-jie · Wang, Yupeng
Original · EN
By using a set of gauge transformations, the exact solutions of the XXZ spin chain with unparallel boundary magnetic fields are derived in the framework of the algebraic Bethe ansatz. In the easy-plane case, we show the elementary excitations are some kind of spinons without definite spin because the U(1) symmetry is broken, while in the easy-axis ferromagnetic case a spiral state is realized in the ground state. The correlation functions, the spin torque as well as the spin voltage for the later case are also derived.
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