| Issue |
EPL
Volume 79, Number 1, July 2007
|
|
|---|---|---|
| Article Number | 17004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/79/17004 | |
| Published online | 07 June 2007 | |
Impurity-assisted tunneling in graphene
Department of Physics, Konstanz University - D-78457 Konstanz, Germany
Received:
27
March
2007
Accepted:
18
May
2007
The electric conductance of a strip of undoped graphene increases in the presence of a disorder potential, which is smooth on atomic scales. The phenomenon is attributed to impurity-assisted resonant tunneling of massless Dirac fermions. Employing the transfer matrix approach we demonstrate the resonant character of the conductivity enhancement in the presence of a single impurity. We also calculate the two-terminal conductivity for the model with one-dimensional fluctuations of disorder potential by a mapping onto a problem of Anderson localization.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 72.15.Rn – Localization effects (Anderson or weak localization)
© Europhysics Letters Association, 2007
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