Mixed spin ladders with exotic ground states

Details Mixed spin ladders with exotic ground states Mixed spin ladders with exotic ground states

1997-12-02

arxiv.org/abs/cond-mat/9712022v1

Eur. Phys. J. B v.5, 543 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 2 figures, RevTeX, uses psfig.sty

Scientific paper

10.1007/s100510050475

We study the "mixed spin" isotropic ladder system having S=1 spins on one leg and S=1/2 spins on the other, with general-type exchange interactions between spins on neighboring rungs. A set of model Hamiltonians with exact ground states in the form of a certain matrix product wave function is obtained. We show that sufficiently strong frustration can lead to exotic singlet ground states with infinite (exponential) degeneracy. We also list a couple of rather simple models with nontrivial ground states, including a model with only bilinear exchange.

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