Superlattice structures in twisted bilayers of folded graphene

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Schmidt, Hennrik; Rode, Johannes C.; Smirnov, Dmitri; Haug, Rolf J.: Superlattice structures in twisted bilayers of folded graphene . In: Nature Communications 5 (2014), 5742. DOI: http://dx.doi.org/10.1038/ncomms6742

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Abstract: 
The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices. Whereas Bernal-stacked graphene is most commonly studied, a rotational mismatch between layers opens up a whole new field of rich physics, especially at small interlayer twist. Here we report on magnetotransport measurements on twisted graphene bilayers, prepared by folding of single layers. These reveal a strong dependence on the twist angle, which can be estimated by means of sample geometry. At small rotation, superlattices with a wavelength in the order of 10 nm arise and are observed by friction atomic force microscopy. Magnetotransport measurements in this small-angle regime show the formation of satellite Landau fans. These are attributed to additional Dirac singularities in the band structure and discussed with respect to the wide range of interlayer coupling models.
License of this version: CC BY 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 77 96.25%
2 image of flag of Puerto Rico Puerto Rico 1 1.25%
3 image of flag of Brazil Brazil 1 1.25%
4 image of flag of Albania Albania 1 1.25%

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