Random spin-1 quantum chains

@article{Boechat1996RandomSQ,
  title={Random spin-1 quantum chains},
  author={Beatriz Boechat and Andreia Saguia and Mucio A. Continentino},
  journal={Solid State Communications},
  year={1996},
  volume={98},
  pages={411-416}
}
We study disordered spin-1 quantum chains with random exchange and biquadratic interactions using a real space renormalization group approach. We find that the dimerized phase of the pure biquadratic model is unstable and gives rise to a random singlet phase in the presence of weak disorder. In the Haldane region of the phase diagram we obtain a quite different behavior. 
Phase diagram of the random Heisenberg antiferromagnetic spin-1 chain.
TLDR
A new perturbative real space renormalization group (RG) is presented to study random quantum spin chains and other one-dimensional disordered quantum systems and finds a random singlet phase for strong disorder.
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