Exact ground state and elementary excitations of a competing spin chain with twisted boundary condition

Abstract

A novel Bethe ansatz scheme is proposed to investigate the exact physical properties of an integrable anisotropic quantum spin chain with competing interactions among the nearest, next nearest neighbor and chiral three spin couplings, where the boundary condition is the twisted one. The eigenvalue of the transfer matrix is characterized by its zero roots instead of the traditional Bethe roots. Based on the exact solution, the conserved momentum and charge operators of this U(1)-symmetry broken system are obtained. The ground state energy and density of rapidities are calculated. It is found that there exist three kinds of elementary excitations and the corresponding dispersion relations are obtained, which gives a different picture from that with periodic boundary condition.

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Cited by in corpus (4)

• Proximate Tomonaga-Luttinger liquid in a spin-1/2 ferromagnetic XXZ chain compound
• Off-diagonal approach to the exact solution of quantum integrable systems
• Elementary excitations in an integrable twisted J1-J2 spin chain in the thermodynamic limit
• Exact surface energies and boundary excitations of the Izergin-Korepin model with generic boundary fields