▎ 摘　　要

A brief review is given on singularities appearing in electronic properties of monolayer graphene at the Dirac point from a theoretical point of view. The topics include effective-mass description of electronic states, singular behavior of the conductivity including the Hall effect and nonuniversality of the minimum conductivity, and the singular diamagnetic response to uniform and spatially varying magnetic field. (C) 2011 American Institute of Physics. [doi:10.1063/1.3575639]