Phonon mediated tunneling into graphene

Details Phonon mediated tunneling into graphene Phonon mediated tunneling into graphene

2008-03-31

arxiv.org/abs/0803.4427v1

Phys. Rev. Lett. 101, 216803 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.216803

Recent scanning tunneling spectroscopy experiments [V. W. Brar et. al., Appl. Phys. Lett. 91, 122102 (2007), Y. Zhang et. al., arXiv:0802.4315 (2008)] on graphene reported an unexpected gap of about $\pm 60$meV around the Fermi level. Here, we give a theoretical investigation explaining the experimentally observed spectra and confirming the phonon mediated tunneling as the reason for the gap: We study the real space properties of the wave functions involved in the tunneling process by means of ab-initio theory and present a model for the electron-phonon interaction, which couples the graphene's Dirac electrons with quasi free electron states at the Brillouin zone center. The self-energy associated with this electron-phonon interaction is calculated and its effects on tunneling into graphene are discussed. In particular, good agreement of the tunneling density of states within our model and the experimental[V. W. Brar et. al., Appl. Phys. Lett. 91, 122102 (2007), Y. Zhang et. al., arXiv:0802.4315 (2008)] dI/dU spectra is found.

Affiliated with

Also associated with

No associations

Rating

Phonon mediated tunneling into graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Phonon mediated tunneling into graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phonon mediated tunneling into graphene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-197362