Phase Diagram of the Heisenberg Spin Ladder with Ring Exchange

Details Phase Diagram of the Heisenberg Spin Ladder with Ring Exchange Phase Diagram of the Heisenberg Spin Ladder with Ring Exchange

2003-10-24

arxiv.org/abs/cond-mat/0310590v2

Phys. Rev. B 69, 094431 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 10 figures

Scientific paper

10.1103/PhysRevB.69.094431

We investigate the phase diagram of a generalized spin-1/2 quantum antiferromagnet on a ladder with rung, leg, diagonal, and ring-exchange interactions. We consider the exactly soluble models associated with the problem, obtain the exact ground states which exist for certain parameter regimes, and apply a variety of perturbative techniques in the regime of strong ring-exchange coupling. By combining these approaches with considerations related to the discrete Z_4 symmetry of the model, we present the complete phase diagram.

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