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Magnetic superlattice and finite-energy Dirac points in graphene
Physical Review B
We study the band structure of graphene's Dirac-Weyl quasi-particles in a one-dimensional magnetic superlattice formed by a periodic sequence of alternating magnetic barriers. The spectrum and the nature of the states strongly depend on the conserved longitudinal momentum and on the barrier width. At the center of the superlattice Brillouin zone we find new Dirac points at finite energies where the dispersion is highly anisotropic, in contrast to the dispersion close to the neutrality pointdoi:10.1103/physrevb.83.155449 fatcat:zfheu6nnmbfghbdpipgfkqf2gq