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Scanning tunneling microscopy and spectroscopy of graphene layers on graphite Adina Luican, Guohong Li and Eva Y. Andrei
 

Summary: Scanning tunneling microscopy and spectroscopy of graphene layers on graphite
Adina Luican, Guohong Li and Eva Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

Abstract:
We report low temperature scanning tunneling microscopy and spectroscopy on graphene flakes
supported on a graphite substrate. The experiments demonstrate that graphite is exceptionally well
suited as a substrate for graphene because it offers support without disturbing the intrinsic properties of
the charge carriers. The degree of coupling of a graphene flake to the substrate was recognized and
characterized from the appearance of an anomalous Landau level sequence in the presence of a
perpendicular magnetic field. By following the evolution of the Landau level spectra along the surface,
we identified graphene flakes that are decoupled or very weakly coupled to the substrate. From the
Landau level sequence in this flake, we extract the local Fermi velocity and energy of the Dirac point and
find extremely weak spatial variation of these quantities confirming the high quality and non invasive
nature of the graphite substrate.


Introduction
Graphene, a oneatom thick layer of crystalline carbon possesses extraordinary electronic properties,
which make it a prime candidate for novel nanoelectronic devices, at the same time raising the

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics