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Raman measurements on monolayer graphene folded back upon itself as anordered but skew-stacked bilayer (i.e. with interlayer rotation) presents newmechanism for Raman scattering in sp2 carbons that arises in systems that lackcoherent AB interlayer stacking. Although the parent monolayer does not exhibita D-band, the interior of the skewed bilayer produces a strong two-peak Ramanfeature near 1350 cm-1; one of these peaks is non-dispersive, unlike allpreviously observed D-band features in sp2 carbons. Within a double-resonantmodel of Raman scattering, these unusual features are consistent with a skewedbilayer coupling, wherein one layer imposes a weak but well-orderedperturbation on the other. The discrete Fourier structure of the rotatedinterlayer interaction potential explains the unusual non-dispersive peak near1350 cm-1.

A non-dispersive Raman D-band activated by well-ordered interlayer interactions in rotationally stacked bi-layer Graphene