Zero and Finite Energy Dirac Points in the Energy Band Structure of   Magnetic Bilayer Graphene Superlattices
  Energy band structure of the bilayer graphene superlattices with $\delta$-function magnetic barriers and zero average magnetic flux is studied within the four-band continuum model, using the transfer matrix method. The periodic magnetic potential effects on the zero-energy Dirac point of pristine bilayer graphene are exactly analyzed. Magnetic potential is shown also to generate finite-energy Dirac points at the edges of Brillouin zone the positions of which and the related dispersions are determined in the case of symmetric potentials. 
C. Huy Pham, T. Thuong Nguyen and V. Lien Nguyen
cond-mat.mes-hall