Integrable Magnetic Model of Two Chains Coupled by Four-Body Interactions

@article{Muramoto1999IntegrableMM,
  title={Integrable Magnetic Model of Two Chains Coupled by Four-Body Interactions},
  author={Norihiro Muramoto and Minoru Takahashi},
  journal={Journal of the Physical Society of Japan},
  year={1999},
  volume={68},
  pages={2098-2104}
}
An exact solution for an XXZ chain with four-body interactions is obtained and its phase diagram is determined. The model can be reduced to two chains coupled by four-body interactions, and it is shown that the ground state of the two-chain model is magnetized in part. Furthermore, a twisted four-body correlation function of the anti-ferromagnetic Heisenberg chain is obtained. 
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