Exact solutions and elementary excitations in the XXZ spin chain with unparallel boundary fields

Details Exact solutions and elementary excitations in the XXZ spin chain with unparallel boundary fields Exact solutions and elementary excitations in the XXZ spin chain with unparallel boundary fields

2002-12-08

arxiv.org/abs/cond-mat/0212163v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, revtex, no figure

Scientific paper

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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