Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-20
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
21 pages with 8 figures (including 4 supplementary figures)
Scientific paper
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.
Chatterjee Eric
Coh Sinisa
Cohen Marvin L.
Crommie Michael F.
Kim Kwanpyo
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