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arXiv · 0803.4427

Phonon mediated tunneling into graphene

T. O. Wehling·I. Grigorenko·A. I. Lichtenstein·A. V. Balatsky
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Abstract

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.

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T. O. Wehling, I. Grigorenko, A. I. Lichtenstein, A. V. Balatsky. 2008-03-31. Phonon mediated tunneling into graphene. https://doi.org/10.1103/physrevlett.101.216803

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