▎ 摘　　要

In Raman spectroscopy of graphite and graphene, the D band at similar to 1355 cm(-1) is used as the indication of the dirtiness of a sample. However, our analysis suggests that the physics behind the D band is closely related to a very clear idea for describing a molecule, namely bonding and antibonding orbitals in graphene. In this paper, we review our recent work on the mechanism for activating the D band at a graphene edge.