Protecting clean critical points by local disorder correlations

@article{Hoyos2011ProtectingCC,
  title={Protecting clean critical points by local disorder correlations},
  author={Jos{\'e} A. Hoyos and Nicolas Laflorencie and Andr{\'e} P. Vieira and Thomas Vojta},
  journal={EPL (Europhysics Letters)},
  year={2011},
  volume={93},
  pages={30004}
}
We show that a broad class of quantum critical points can be stable against locally correlated disorder even if they are unstable against uncorrelated disorder. Although this result seemingly contradicts the Harris criterion, it follows naturally from the absence of a random-mass term in the associated order parameter field theory. We illustrate the general concept with explicit calculations for quantum spin-chain models. Instead of the infinite-randomness physics induced by uncorrelated… 
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