Scanning Tunneling Spectroscopy of Graphene on Graphite

Details Scanning Tunneling Spectroscopy of Graphene on Graphite Scanning Tunneling Spectroscopy of Graphene on Graphite

2008-03-28

arxiv.org/abs/0803.4016v2

Phys. Rev. Lett 102, 176804 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.102.176804

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 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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