Edge States and Stacking Effects in Nanographene Systems
  Bilayer graphene nanoribbon with zigzag edge is investigated with the tight binding model. Two stacking structures, alpha and beta, are considered. The band splitting is seen in the alpha structure, while the splitting in the wave number direction is found in the beta structure. The local density of states in the beta structure tend to avoid sites where inter-layer hopping interactions are present. 
Kikuo Harigaya, Hiroshi Imamura, Katsunori Wakabayashi, Osman Ozsoy
cond-mat.mes-hall cond-mat.mtrl-sci physics.chem-ph