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We provide a thorough study of a carbon divacancy, a fundamental but almostunexplored point defect in graphene. Low temperature scanning tunnelingmicroscopy (STM) imaging of irradiated graphene on different substrates enabledus to identify a common two-fold symmetry point defect. Our first principlescalculations reveal that the structure of this type of defect accommodates twoadjacent missing atoms in a rearranged atomic network formed by two pentagonsand one octagon, with no dangling bonds. Scanning tunneling spectroscopy (STS)measurements on divacancies generated in nearly ideal graphene show anelectronic spectrum dominated by an empty-states resonance, which is ascribedto a spin-degenerated nearly flat band of $\pi$-electron nature. While thecalculated electronic structure rules out the formation of a magnetic momentaround the divacancy, the generation of an electronic resonance near the Fermilevel, reveals divacancies as key point defects for tuning electron transportproperties in graphene systems.

Electronic and structural characterization of divacancies in irradiated graphene