Raman spectroscopy study of rotated double-layer graphene: Misorientation-angle dependence of electronic structure
arXiv:1201.4221 · doi:10.1103/PhysRevLett.108.246103
Abstract
We present a systematic Raman study of unconventionally-stacked double-layer graphene, and find that the spectrum strongly depends on the relative rotation angle between layers. Rotation-dependent trends in the position, width and intensity of graphene 2D and G peaks are experimentally established and accounted for theoretically. Our theoretical analysis reveals that changes in electronic band structure due to the interlayer interaction, such as rotational-angle dependent Van Hove singularities, are responsible for the observed spectra features. Our combined experimental and theoretical study provides a deeper understanding of the electronic band structure of rotated double-layer graphene, and leads to a practical way to identify and analyze rotation angles of misoriented double-layer graphene.
To appear in Phys. Rev. Lett., added extra data, 22 pages with 10 figures (including 6 supplementary figures)
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