Volume 79, Number 1, July 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 June 2007|
Impurity-assisted tunneling in graphene
Department of Physics, Konstanz University - D-78457 Konstanz, Germany
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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