Exact solution of a spin-ladder model

Details Exact solution of a spin-ladder model Exact solution of a spin-ladder model

1999-01-18

arxiv.org/abs/cond-mat/9901168v1

Physics

Condensed Matter

Strongly Correlated Electrons

6page Revtex, no figure

Scientific paper

10.1103/PhysRevB.60.9236

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.

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