Transport in chemically doped graphene in the presence of adsorbed molecules

被引:148
作者
Hwang, E. H. [1 ]
Adam, S. [1 ]
Das Sarma, S. [1 ]
机构
[1] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
关键词
D O I
10.1103/PhysRevB.76.195421
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Motivated by a recent experiment reporting on the possible application of graphene as sensors, we calculate transport properties of two-dimensional 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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页数:6
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