Topological Kondo effect with Majorana fermions.

@article{Bri2012TopologicalKE,
  title={Topological Kondo effect with Majorana fermions.},
  author={Benjamin B{\'e}ri and N. Cooper},
  journal={Physical review letters},
  year={2012},
  volume={109 15},
  pages={
          156803
        }
}
The Kondo effect is a striking consequence of the coupling of itinerant electrons to a quantum spin with degenerate energy levels. While degeneracies are commonly thought to arise from symmetries or fine-tuning of parameters, the recent emergence of Majorana fermions has brought to the fore an entirely different possibility: a topological degeneracy that arises from the nonlocal character of Majorana fermions. Here we show that nonlocal quantum spins formed from these degrees of freedom give… 
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