Exact solution of a spin-ladder model

Abstract

An integrable spin-ladder model with nearest-neighbor exchanges and biquadratic interactions is proposed. With the Bethe ansatz solutions of the model hamiltonian, it is found that there are three possible phases in the ground state, i.e., a rung-dimerized phase with a spin gap, and two massless phases. The possible fixed points of the system and the quantum critical behavior at the critical point $J=J_{+}^c$ are discussed.

6page Revtex, no figure

References in corpus (4)

• SU(4) Theory for Spin Systems with Orbital Degeneracy
• Non-Haldane Spin Liquid Models with Exact Ground States
• NMR study of the S=1/2 Heisenberg Ladder Cu2(C5H12N2)2Cl4 : Quantum phase transition and critical dynamics
• Finitely Correlated Generalized Spin Ladders

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