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Phys Rev Lett. 2009 May 1;102(17):176804. Epub 2009 Apr 29.

Scanning tunneling spectroscopy of graphene on graphite.

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1
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Abstract

We report low temperature high magnetic field scanning tunneling microscopy and spectroscopy of graphene flakes on graphite that exhibit the structural and electronic properties of graphene decoupled from the substrate. Pronounced peaks in the tunneling spectra develop with increasing field revealing a Landau level sequence that provides a direct way to identify graphene and to determine the degree of its coupling to the substrate. The Fermi velocity and quasiparticle lifetime, obtained from the positions and width of the peaks, provide access to the electron-phonon and electron-electron interactions.

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