Approaching the dirac point in high-mobility multilayer epitaxial graphene.
Multilayer epitaxial graphene is investigated using far infrared transmission experiments in the different limits of low magnetic fields and high temperatures. The cyclotron-resonance-like absorption is observed at low temperature in magnetic fields below 50 mT, probing the nearest vicinity of the Dirac point. The carrier mobility is found to exceed 250,000 cm2/(V x s). In the limit of high temperatures, the well-defined Landau level quantization is observed up to room temperature at magnetic fields below 1 T, a phenomenon unusual in solid state systems. A negligible increase in the width of the cyclotron resonance lines with increasing temperature indicates that no important scattering mechanism is thermally activated.
Orlita
M
M
Grenoble High Magnetic Field Laboratory, CNRS, BP 166, F-38042 Grenoble Cedex 09, France. orlita@karlov.mff.cuni.cz
Faugeras
C
C
Plochocka
P
P
Neugebauer
P
P
Martinez
G
G
Maude
D K
DK
Barra
A L
AL
Sprinkle
M
M
Berger
C
C
de Heer
W A
WA
Potemski
M
M