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.
Highlights
The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices
We present a study on high-quality folded graphene monolayers of different twist angles y, the smallest of which lead to novel transport features in the form of satellite Landau fans, caused by twist-induced long-wavelength superlattices
Our folded layers are obtained by mechanical manipulation via atomic force microscope (AFM) or incidental flip-over during the exfoliation of natural graphite
Summary
The electronic properties of bilayer graphene strongly depend on relative orientation of the two atomic lattices. 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. 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. We present a study on high-quality folded graphene monolayers of different twist angles y, the smallest of which lead to novel transport features in the form of satellite Landau fans, caused by twist-induced long-wavelength superlattices
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