Nondispersive Raman D band activated by well-ordered interlayer interactions in rotationally stacked bilayer graphene

Article

关键词: GRAPHITE;    CARBON;    SPECTROSCOPY;    SCATTERING;    SPECTRA;    FILMS;    LAYER;   

DOI  :  10.1103/PhysRevB.82.241406

来源: SCIE

【 摘 要 】

Raman measurements on monolayer graphene folded back upon itself into skewed bilayer (i.e., with interlayer rotation) presents a mechanism for Raman scattering in sp(2) carbons in the D-band frequency range, but without disorder. Although the parent monolayer does not exhibit a D band, the interior of the skewed bilayer produces a strong two-peak Raman feature near 1350 cm(-1); one of these peaks is nondispersive, unlike all previously observed D-band features. Within a double-resonant model of Raman scattering, these features are consistent with a skewed bilayer coupling wherein one layer imposes a weak but well-ordered perturbation on the other. The discrete Fourier structure of the rotated interlayer interaction potential explains the unusual nondispersive peak.

【 授权许可】

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