Band-unfolding approach to Moirè-induced band-gap opening and Fermi-level-velocity reduction in twisted bilayer graphene
arXiv:1609.05297 · doi:10.1103/PhysRevB.95.085420
Abstract
We report on the energy spectrum of electrons in twisted bilayer graphene (tBLG) obtained by the band-unfolding method in the tight-binding model. We find the band-gap opening at particular points in the reciprocal space, that elucidates the drastic reduction of the Fermi-level velocity with the tiny twisted angles in tBLGs. We find that Moirè pattern caused by the twist of the two graphene layers generates interactions among Dirac cones, otherwise absent, and the resultant cone-cone interactions peculiar to each point in the reciprocal space causes the energy gap and thus reduced the Fermi-level velocity.
8 pages, 9 figures
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Cited by in corpus (5)
- Lattice relaxation, mirror symmetry and magnetic field effects on ultraflat bands in twisted trilayer graphene
- Observation of Coexisting Dirac Bands and Moiré Flat Bands in Magic-Angle Twisted Trilayer Graphene
- Unfolding energy spectra of multi-periodicity materials
- Twisted bilayer graphene fabricated by direct bonding in a high vacuum
- Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene