Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphite

Details Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphite Phonon and plasmon excitation in inelastic electron tunneling spectroscopy of graphite

2003-10-28

arxiv.org/abs/cond-mat/0310666v1

Physics

Condensed Matter

PRB rapid communication, submitted

Scientific paper

10.1103/PhysRevB.69.121414

The inelastic electron tunneling spectrum (IETS)of highly oriented pyrolitic graphite (HOPG) has been measured with scanning tunneling spectroscopy (STS) at 6K. The observed spectral features are in very good agreement with the vibrational density of states (vDOS) of graphite calculated from first principles. We discuss the enhancement of certain phonon modes by phonon-assisted tunneling in STS based on the restrictions imposed by the electronic structure of graphite. We also demonstrate for the first time the local excitation of surface-plasmons in IETS which are detected at an energy of 40 meV.

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