Abstract
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 Hall plateau is ultimately due to the orthogonality of forward and backward channels, much like in the Klein paradox.
- Received 26 March 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.106802
© 2010 The American Physical Society