Enhanced Intervalley Scattering of Twisted Bilayer Graphene by Periodic AB Stacked Atoms
arXiv:1206.3615 · doi:10.1103/PhysRevB.85.235453
Abstract
The electronic properties of twisted bilayer graphene on SiC substrate were studied via combination of transport measurements and scanning tunneling microscopy. We report the observation of enhanced intervalley scattering from one Dirac cone to the other, which contributes to weak localization, of the twisted bilayer graphene by increasing the interlayer coupling strength. Our experiment and analysis demonstrate that the enhanced intervalley scattering is closely related to the periodic AB stacked atoms (the A atom of layer 1 and the B atom of layer 2 that have the same horizontal positions) that break the sublattice degeneracy of graphene locally. We further show that these periodic AB stacked atoms affect intervalley but not intravalley scattering. The result reported here provides an effective way to atomically manipulate the intervalley scattering of graphene.
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References in corpus (14)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Valley filter and valley valve in graphene
- Weak localisation magnetoresistance and valley symmetry in graphene
- Flat Bands in Slightly Twisted Bilayer Graphene
- Single Layer Behavior and Its Breakdown in Twisted Graphene Layers
- Graphene valley filter using a line defect
- Weak localisation in graphene flakes
- Intervalley scattering, long-range disorder, and effective time reversal symmetry breaking in graphene
- Weak antilocalization in epitaxial graphene: evidence for chiral electrons
- Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
- Influence of trigonal warping on interference effects in bilayer graphene
- Topologically Protected Zero Modes in Twisted Bilayer Graphene
- Evidence for spin-flip scattering and local moments in dilute fluorinated graphene
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- SU(4) symmetry breaking revealed by magneto-optical spectroscopy in epitaxial graphene