Pseudodiffusive conduction at the Dirac point of a normal-superconductor junction in graphene

@article{Akhmerov2007PseudodiffusiveCA,
  title={Pseudodiffusive conduction at the Dirac point of a normal-superconductor junction in graphene},
  author={A. Akhmerov and C. W. J. Beenakker},
  journal={Physical Review B},
  year={2007},
  volume={75},
  pages={045426}
}
A ballistic strip of graphene (width $W⪢\text{length}$ $L$) connecting two normal metal contacts is known to have a minimum conductivity of $4{e}^{2}∕\ensuremath{\pi}h$ at the Dirac point of charge neutrality. We calculate what happens if one of the two contacts becomes superconducting. While the ballistic conductance away from the Dirac point is increased by Andreev reflection at the normal-superconductor (NS) interface, we find that the minimum conductivity stays the same. This is explained… 
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