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Metal atoms on graphene, when ionized, can act as a point charge impurity toprobe a charge response of graphene with the Dirac cone band structure. Tounderstand the microscopic physics of the metal-atom-induced charge and spinpolarization in graphene, we present scanning tunneling spectroscopy (STS)simulations based on density functional theory calculations. We find that a Csatom on graphene are fully ionized with a significant band bending feature inthe STS, whereas the charge and magnetic states of Ba and La atoms on grapheneappear to be complicated due to orbital hybridization and Coulomb interaction.By applying an external electric field, we observe changes in charge donationsand spin magnetic moments of the metal adsorbates on graphene.

Tunable charge donation and spin polarization of metal adsorbates on graphene using applied electric field