Dirac cones and minigaps for graphene on Ir(111).
Epitaxial graphene on Ir(111) prepared in excellent structural quality is investigated by angle-resolved photoelectron spectroscopy. It clearly displays a Dirac cone with the Dirac point shifted only slightly above the Fermi level. The moiré resulting from the overlaid graphene and Ir(111) surface lattices imposes a superperiodic potential giving rise to Dirac cone replicas and the opening of minigaps in the band structure.
Pletikosić
I
I
Institut za fiziku, Bijenicka 46, 10000 Zagreb, Croatia.
Kralj
M
M
Pervan
P
P
Brako
R
R
Coraux
J
J
N'diaye
A T
AT
Busse
C
C
Michely
T
T