Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-06
Phys. Rev. Lett. 102, 206603 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
further experiments proving the point are reported in the final version
Scientific paper
10.1103/PhysRevLett.102.206603
It is widely assumed that the dominant source of scattering in graphene is charged impurities in a substrate. We have tested this conjecture by studying graphene placed on various substrates and in high-k media. Unexpectedly, we have found no significant changes in carrier mobility either for different substrates or by using glycerol, ethanol and water as a top dielectric layer. This suggests that Coulomb impurities are not the scattering mechanism that limits the mean free path currently attainable for graphene on a substrate.
Geim Andre K.
Hill Ernie W.
Katsnelson Mikhail I.
Mohiuddin Tariq M.
Morozov S. M.
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