Tight-binding description of Landau levels of graphite in tilted   magnetic fields
  The electronic structure of Bernal-stacked graphite subject to tilted magnetic fields is studied theoretically. The minimal nearest-neighbor tight-binding model with the Peierls substitution is employed to describe the structure of Landau levels. We show that while the orbital effect of the in-plane component of the magnetic field is negligible for massive Dirac fermions in the vicinity of the K point of the graphite Brillouin zone, at the H point it leads to the experimentally observable splitting of Landau levels, which grows approximately linearly with the in-plane field intensity. 
Nataliya A. Goncharuk and Ludvik Smrcka
cond-mat.mes-hall cond-mat.mtrl-sci