▎ 摘　　要

Using ab-initio density functional theory the electronic response is studied for graphene subjected to an external superlattice potential. Different potential strengths and crystallographic directions forming one-dimensional (1D) superlattices with zigzag and armchair edges are investigated. The graphene band structure and the screening effect are self-consistently taken into account. The Dirac points appear slightly displaced in reciprocal space with a strongly anisotropic Fermi velocity. The screening tends to weaken the potential action and renormalization of the Fermi velocity. We demonstrate that the vanishing group velocity perpendicular to the superlattice as predicted for non-interacting massless Dirac fermions still occurs although somewhat modified by the self-consistent reaction of the system. Features of a quasi-1D metal remain observable.