Modulation structure of a frustrated spin ladder

Abstract

We study a two-leg spin-1/2 ladder with isotropic exchanges and biquadratic interactions in the basic plaquettes. It is shown that for the extremely frustrated case, the system exhibits a self-organized phase separation. In some parameter regions, the singlet rungs form a Wigner-like lattice in the triplet-rung host. There are three types of elementary excitations in this modulation phase, i.e., the spinons in a triplet domain, the broken singlet rungs and the deformation of the Wigner-like lattice. The flux phase induced by an external magnetic field in the rung-dimerized phase is also discussed.

7 pages Revtex, no figure, to appear in Int. J. Mod. Phys. 28

References in corpus (5)

• Non-Haldane Spin Liquid Models with Exact Ground States
• Finitely Correlated Generalized Spin Ladders
• Exact solution of a spin-ladder model
• Exact Results for a Kondo Problem in One Dimensional t-J Model
• An Exactly Solvable Model of Generalized Spin Ladder

Cited by in corpus (3)

• Phases of the generalized two-leg spin ladder: A view from the SU(4) symmetry
• Open su(4)-invariant spin ladder with boundary defects
• Exactly soluble isotropic spin-1/2 ladder models