Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-03-09
Phys. Rev. Lett. 103, 136403 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, to appear in PRL
Scientific paper
10.1103/PhysRevLett.103.136403
Fabrication of graphene structures has triggered vast research efforts focused on the properties of two-dimensional systems with massless Dirac fermions. Nevertheless, further progress in exploring this quantum electrodynamics system in solid-state laboratories seems to be limited by insufficient electronic quality of manmade structures and the crucial question arises whether existing technologies have reached their limits or major advances are in principle possible. Here we show that graphene in a significantly purer state can be found in nature on the surface of bulk graphite, in form of flakes decoupled from the substrate material. Probing such flakes with Landau level spectroscopy in the THz range at very low magnetic fields, we demonstrate a superior electronic quality of these ultra low density layers (n~3x10^9 cm^-2) expressed by the carrier mobility in excess of 10^7 cm^2/(V.s). This finding represents an important challenge for further improvements of current graphene technologies.
Barra Anne Laure
Faugeras Clement
Neugebauer Petr
Orlita Milan
Potemski Marek
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