2006/10/31 by E. H. Hwang, Shaffique Adam, S. Adam +1 · 5 citations
Engineering · Materials Science · Physics and Astronomy · #Advancements in Battery Materials #Graphene research and applications #Quantum and electron transport phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.76.195421
published as Phys. Rev. B 76, 195421 (2007) · Revised version, accepted for publication in Phys. Rev. B
arxiv created 2007/10/29 · openalex publication_date 2007/11/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.