Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-11-04
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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