  Influence of the chiral symmetry on the many-body problem in multilayer
graphene in magnetic fields is investigated. For a spinless electron model on
the honeycomb lattice the many-body ground state is shown to be a
doubly-degenerate chiral condensate irrespective of the number of layers. The
energy spectrum calculated numerically with the exact diagonalization method
reveals for ABC-stacked multilayer graphenes that the many-body gap decreases
monotonically with the number of layers.
