Graphene nanoribbons can be folded into a double layer system keeping the two layers decoupled. In the Quantum Hall regime folds behave as a new type of Hall bar edge. We show that the symmetry properties of the zero Landau level in metallic nanoribbons dictate that the zero energy edge states traversing a fold are perfectly transmitted onto the opposite layer. This result is valid irrespective of fold geometry, magnetic field strength and crystallographic orientation of the nanoribbon. Backscattering suppression on the N=0 Hall plateau is ultimately due to the orthogonality of forward and backward channels, much like in the Klein paradox.
@article{arxiv.1003.1124,
title = {Zero Landau level in folded graphene nanoribbons},
author = {Elsa Prada and Pablo San-Jose and Luis Brey},
journal= {arXiv preprint arXiv:1003.1124},
year = {2010}
}
Comments
Final published version, with supplementary material appendix