First direct observation of a nearly ideal graphene band structure.
Angle-resolved photoemission and x-ray diffraction experiments show that multilayer epitaxial graphene grown on the SiC(0001) surface is a new form of carbon that is composed of effectively isolated graphene sheets. The unique rotational stacking of these films causes adjacent graphene layers to electronically decouple leading to a set of nearly independent linearly dispersing bands (Dirac cones) at the graphene K point. Each cone corresponds to an individual macroscale graphene sheet in a multilayer stack where AB-stacked sheets can be considered as low density faults.
Sprinkle
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The Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
Siegel
D
D
Hu
Y
Y
Hicks
J
J
Tejeda
A
A
Taleb-Ibrahimi
A
A
Le Fèvre
P
P
Bertran
F
F
Vizzini
S
S
Enriquez
H
H
Chiang
S
S
Soukiassian
P
P
Berger
C
C
de Heer
W A
WA
Lanzara
A
A
Conrad
E H
EH