title: Superlattice structures in twisted bilayers of folded graphene.
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.
authors.affiliation: 1] Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover 30167, Germany [2] Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore.
authors.forename: Hennrik
authors.initials: H
authors.lastname: Schmidt
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover 30167, Germany.
authors.forename: Johannes C
authors.initials: JC
authors.lastname: Rode
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover 30167, Germany.
authors.forename: Dmitri
authors.initials: D
authors.lastname: Smirnov
authors.affiliation: Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover 30167, Germany.
authors.forename: Rolf J
authors.initials: RJ
authors.lastname: Haug