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Temperature dependence of the diffusive conductivity of bilayer graphene Shaffique Adam and M. D. Stiles
 

Summary: Temperature dependence of the diffusive conductivity of bilayer graphene
Shaffique Adam and M. D. Stiles
Center for Nanoscale Science and Technology, National Institute of Standards and Technology,
Gaithersburg, Maryland 20899-6202, USA
Received 29 December 2009; revised manuscript received 22 July 2010; published 24 August 2010
Assuming diffusive carrier transport and employing an effective medium theory, we calculate the tempera-
ture dependence of bilayer graphene conductivity due to Fermi-surface broadening as a function of carrier
density. We find that the temperature dependence of the conductivity depends strongly on the amount of
disorder. In the regime relevant to most experiments, the conductivity is a function of T/T , where T is the
characteristic temperature set by disorder. We demonstrate that experimental data taken from various groups
collapse onto a theoretically predicted scaling function.
DOI: 10.1103/PhysRevB.82.075423 PACS number s : 72.80.Vp, 73.23. b, 72.80.Ng
I. INTRODUCTION
Monolayer and bilayer graphene are distinct electronic
materials. Monolayer graphene is a sheet of carbon in a hon-
eycomb lattice that is one atom thick while bilayer graphene
comprises two such sheets, with the first lattice 0.3 nm above
the second. Since the first transport measurements1,2 in 2005,
we have come a long way in understanding the basic trans-
port mechanisms of carriers in these new carbon allotropes.

  

Source: Adam, Shaffique - Condensed Matter Theory Center, University of Maryland at College Park

 

Collections: Physics