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Charged impurity scattering in bilayer graphene Shudong Xiao,1,2 Jian-Hao Chen,1,2 Shaffique Adam,1,3 Ellen D. Williams,1,2 and Michael S. Fuhrer1,2,*
 

Summary: Charged impurity scattering in bilayer graphene
Shudong Xiao,1,2 Jian-Hao Chen,1,2 Shaffique Adam,1,3 Ellen D. Williams,1,2 and Michael S. Fuhrer1,2,*
1
Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA
2Materials Research Science and Engineering Center, University of Maryland, College Park, Maryland 20742, USA
3Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
Received 8 August 2009; revised manuscript received 3 May 2010; published 16 July 2010
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 24 1012
cm-2
. Upon addition of charged impurities of concentration
nimp, the minimum conductivity min decreases proportional to nimp
-1/2
while the electron and hole puddle carrier
density increases proportional to nimp
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

  

Source: Adam, Shaffique - Condensed Matter Theory Center, University of Maryland at College Park
Fuhrer, Michael S - Center for Superconductivity Research & Department of Physics, University of Maryland at College Park
Rubloff, Gary W. - Institute for Systems Research, University of Maryland at College Park

 

Collections: Materials Science; Physics