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Scanning Tunneling Spectroscopy of Graphene on Graphite Guohong Li, Adina Luican, and Eva Y. Andrei
 

Summary: Scanning Tunneling Spectroscopy of Graphene on Graphite
Guohong Li, Adina Luican, and Eva Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
(Received 6 December 2008; published 29 April 2009)
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.
DOI: 10.1103/PhysRevLett.102.176804 PACS numbers: 73.20.At, 71.70.Di, 73.43.Jn
Graphene, a one-atom thick form of crystalline-carbon
[13] possesses extraordinary electronic properties owing
to charge-carriers that move like ultrarelativistic particles
(massless) Dirac-fermions (DF). Their relativistic nature
becomes evident in the presence of a magnetic field
through the appearance of an unusual Landau level (LL)
sequence [2] with square-root dependence on field, B, and
level index n together with a unique field independent n
0 level at the Dirac point (DP). One of the first manifes-

  

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

 

Collections: Materials Science; Physics