Effect of high-k environment on charge carrier mobility in graphene

Details Effect of high-k environment on charge carrier mobility in graphene Effect of high-k environment on charge carrier mobility in graphene

2008-09-06

arxiv.org/abs/0809.1162v2

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.

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