Enhanced Intervalley Scattering of Twisted Bilayer Graphene by Periodic   AB Stacked Atoms
  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. 
Lan Meng, Zhao-Dong Chu, Yanfeng Zhang, Ji-Yong Yang, Rui-Fen Dou,   Jia-Cai Nie, and Lin He
cond-mat.mes-hall