TY  - JOUR
AU  - Jugovac, Matteo
AU  - Genuzio, Francesca
AU  - Menteş, Tevfik Onur
AU  - Locatelli, Andrea
AU  - Zamborlini, Giovanni
AU  - Feyer, Vitaliy
AU  - Schneider, Claus Michael
TI  - Tunable coupling by means of oxygen intercalation and removal at the strongly interacting graphene/cobalt interface
JO  - Carbon
VL  - 163
SN  - 0008-6223
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2020-04760
SP  - 341 - 347
PY  - 2020
AB  - It is well known that intercalated species can strongly affect the graphene-substrate interaction. As repeatedly shown by experiment and theory, the intercalation of atomic species may establish a free-standing character in chemisorbed graphene systems. Here, we focus on graphene grown on a strongly interacting support, cobalt, and demonstrate that the film electronic structure and doping can be tuned via the intercalation/removal of interfacial oxygen. Importantly, cathode lens microscopy reveals the main mechanism of oxygen intercalation, and in particular how microscopic openings in the mesh enable oxygen accumulation at the graphene-cobalt interface. Our experiments show that this process can be carefully controlled through temperature, without affecting the film morphology and crystalline quality. The presence of oxygen at the interface induces an upward shift of the graphene π band, moving its crossing above the Fermi level, accompanied by an increased Fermi velocity and reduced momentum width. Control on the graphene coupling to cobalt may enable one to alter the induced spin polarization in graphene’s electronic states.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000536475900009
DO  - DOI:10.1016/j.carbon.2020.03.034
UR  - https://juser.fz-juelich.de/record/888206
ER  -