Structure and electronic properties of graphene nanoislands on Co(0001).
We have grown well-ordered graphene adlayers on the lattice-matched Co(0001) surface. Low-temperature scanning tunneling microscopy measurements demonstrate an on-top registry of the carbon atoms with respect to the Co(0001) surface. The tunneling conductance spectrum shows that the electronic structure is substantially altered from that of isolated graphene, implying a strong coupling between graphene and cobalt states. Calculations using density functional theory confirm that structures with on-top registry have the lowest energy and provide clear evidence for strong electronic coupling between the graphene pi-states and Co d-states at the interface.
Eom
Daejin
D
Nanoscale Science and Engineering Center, Columbia University, New York, New York 10027, USA.
Prezzi
Deborah
D
Rim
Kwang Taeg
KT
Zhou
Hui
H
Lefenfeld
Michael
M
Xiao
Shengxiong
S
Nuckolls
Colin
C
Hybertsen
Mark S
MS
Heinz
Tony F
TF
Flynn
George W
GW