Modulation structure of a frustrated spin ladder

Details Modulation structure of a frustrated spin ladder Modulation structure of a frustrated spin ladder

1999-11-04

arxiv.org/abs/cond-mat/9911049v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1142/S0217979299003040

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.

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