Atomic configuration of defects in graphene and corresponding PDOS projected on three carbon atoms around monovacancy defects. Grey and cyan atoms correspond to carbon atoms in different sublattices. Yellow atoms are carbon atoms around defect. (a) One single vacancy in graphene. (b) Two vacancies in graphene, which are in the same sublattice of graphene. (c) Two vacancies in graphene: left-hand vacancy is in B sublattice, and right-hand vacancy is in A sublattice. (d) Two vacancies in graphene: left-hand vacancy is in A sublattice, and right-hand vacancy is in B sublattice. (e)–(h) Corresponding PDOS projected on three carbon atoms around monovacancy defect of panels (a)–(d), respectively.