Correspondence between Andreev reflection and Klein tunneling in bipolar graphene

@article{Beenakker2008CorrespondenceBA,
  title={Correspondence between Andreev reflection and Klein tunneling in bipolar graphene},
  author={C. W. J. Beenakker and A. Akhmerov and Patrik Recher and Jakub Tworzydło},
  journal={Physical Review B},
  year={2008},
  volume={77},
  pages={075409}
}
The Andreev reflection at a superconductor and the Klein tunneling through an $n\text{\ensuremath{-}}p$ junction in graphene are two processes that couple electrons to holes\char22{}the former through the superconducting pair potential $\ensuremath{\Delta}$ and the latter through the electrostatic potential $U$. We derive that the energy spectra in the two systems are identical at low energies $\ensuremath{\epsilon}⪡\ensuremath{\Delta}$ and for an antisymmetric potential profile $U(\ensuremath… 

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