Quantum spin ladder systems associated with su(2|2)

Details Quantum spin ladder systems associated with su(2|2) Quantum spin ladder systems associated with su(2|2)

2000-10-02

arxiv.org/abs/cond-mat/0010035v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

Two integrable quantum spin ladder systems will be introduced associated with the fundamental su(2|2) solution of the Yang-Baxter equation. The first model is a generalized quantum Ising system with Ising rung interactions. In the second model the addition of extra interactions allows us to impose Heisenberg rung interactions without violating integrability. The existence of a Bethe ansatz solution for both models allows us to investigate the elementary excitations for antiferromagnetic rung couplings. We find that the first model does not show a gap whilst in the second case there is a gap for all positive values of the rung coupling.

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