▎ 摘　　要

We investigated electronic structure modulation of graphene partially covered by Pd, Ag, Pt, and Au pillars by using first-principles total-energy calculations to simulate the effects of metal electrodes on the electronic structure of graphene. Our calculations show that the electrostatic potential in graphene strongly depends not only on the metal species but also on its displacement from the electrodes. This potential modulation leads to an energy shift of the Dirac point of graphene, resulting in carrier transfer between graphene and the metal pillars depending on the metal species and spatial position. (c) 2012 The Japan Society of Applied Physics