Misoriented bilayer graphene in a magnetic field: Optical transitions at commensurate angles

Details Misoriented bilayer graphene in a magnetic field: Optical transitions at commensurate angles Misoriented bilayer graphene in a magnetic field: Optical transitions at commensurate angles

2011-02-28

arxiv.org/abs/1102.5660v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

Misoriented bilayer graphene with commensurate angles shows unique magneto-optical properties. The optical absorption spectra of such a system strongly depend on the angle of rotation. For a general commensurate twist angle the absorption spectra has a simple single-peak structure. However, our studies indicate that there are special angles at which the absorption spectra of the rotated bilayer exhibit well developed multi-peak structures. These angles correspond to even symmetry of the rotated graphene with respect to the sublattice exchange. Magneto-spectroscopy can therefore be a potentially useful scheme to determine the twist angles.

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