title: Magnetic Kronig-Penney-type graphene superlattices: finite energy Dirac points with anisotropic velocity renormalization.
abstract: We study the energy band structure of magnetic graphene superlattices with delta-function magnetic barriers and zero average magnetic field. The dispersion relation obtained using the T-matrix approach shows the emergence of an infinite number of Dirac-like points at finite energies, while the original Dirac point is still located at the same place as that for pristine graphene. The carrier group velocity at the original Dirac point is isotropically renormalized, but at finite energy Dirac points it is generally anisotropic. An asymmetry in the width between the wells and the barriers of the periodic potential induces a shift of the original Dirac point in the zero-energy plane, keeping the velocity renormalization isotropic.
authors: Theoretical and Computational Department, Institute of Physics, VAST, 10 Dao Tan, Ba Dinh District, Hanoi 10000, Vietnam.
authors: V
authors: V
authors: Qui Le
authors: C
authors: C
authors: Huy Pham
authors: V
authors: V
authors: Lien Nguyen
mesh_terms: D016880:Anisotropy; D006108:Graphite / Q000737:chemistry*; D060328:Magnetic Phenomena; D013057:Spectrum Analysis
chemical_list: D006108:Graphite