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.
Physical Review Letters
- Pub Date:
- May 2009
- Surface states band structure electron density of states;
- Landau levels;
- Condensed Matter - Mesoscale and Nanoscale Physics
- Phys. Rev. Lett 102, 176804 (2009)