Journal
PHYSICAL REVIEW B
Volume 82, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.041406
Keywords
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Funding
- NSF-UMD-MRSEC [DMR 05-20471]
- U.S. ONR MURI [N000140911064]
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We have examined the impact of charged impurity scattering on charge carrier transport in bilayer graphene (BLG) by deposition of potassium in ultrahigh vacuum at low temperature. Charged impurity scattering gives a conductivity which is supralinear in carrier density with a magnitude similar to single-layer graphene for the measured range of carrier densities of 2-4 x 10(12) cm(-2). Upon addition of charged impurities of concentration n(imp), the minimum conductivity sigma(min) decreases proportional to n(imp)(-1/2) while the electron and hole puddle carrier density increases proportional to n(imp)(1/2). These results for the intentional deposition of potassium on BLG are consistent with theoretical predictions for charged impurity scattering assuming a gapless hyperbolic dispersion relation. However, our results also suggest that charged impurity scattering alone cannot explain the observed transport properties of pristine BLG on SiO(2) before potassium doping.
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