Transport in chemically doped graphene in the presence of adsorbed molecules

Details Transport in chemically doped graphene in the presence of adsorbed molecules Transport in chemically doped graphene in the presence of adsorbed molecules

2006-10-30

arxiv.org/abs/cond-mat/0610834v2

Phys. Rev. B 76, 195421 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revised version, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.195421

Motivated by a recent experiment reporting on the possible application of graphene as sensors, we calculate transport properties of 2D graphene monolayers in the presence of adsorbed molecules. We find that the adsorbed molecules, acting as compensators that partially neutralize the random charged impurity centers in the substrate, enhance the graphene mobility without much change in the carrier density. We predict that subsequent field-effect measurements should preserve this higher mobility for both electrons and holes, but with a voltage induced electron-hole asymmetry that depends on whether the adsorbed molecule was an electron or hole donor in the compensation process. We also calculate the low density magnetoresistance and find good quantitative agreement with experimental results.

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