Density of States and Zero Landau Level Probed through Capacitance of Graphene

摘要: We report capacitors in which a finite electronic compressibility of graphene dominates the electrostatics, resulting pronounced changes capacitance as function magnetic field and carrier concentration. The measurements have allowed us to accurately map density states D, compare it against theoretical predictions. Landau oscillations D are robust zero level (LL) can easily be seen at room temperature moderate fields. broadening LLs is strongly affected by charge inhomogeneity that leads LL being broader than other levels.