Zero Landau level in folded graphene nanoribbons

Details Zero Landau level in folded graphene nanoribbons Zero Landau level in folded graphene nanoribbons

2010-03-04

arxiv.org/abs/1003.1124v4

Phys. Rev. Lett. 105, 106802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final published version, with supplementary material appendix

Scientific paper

10.1103/PhysRevLett.105.106802

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.

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