Measurement of Scattering Rate and Minimum Conductivity in Graphene

Y.-W. Tan, Y. Zhang, K. Bolotin, Y. Zhao, S. Adam, E. H. Hwang, S. Das Sarma, H. L. Stormer, and P. Kim
Phys. Rev. Lett. 99, 246803 – Published 14 December 2007

Abstract

The conductivity of graphene samples with various levels of disorder is investigated for a set of specimens with mobility in the range of 120×103cm2/Vsec. Comparing the experimental data with the theoretical transport calculations based on charged impurity scattering, we estimate that the impurity concentration in the samples varies from 215×1011cm2. In the low carrier density limit, the conductivity exhibits values in the range of 212e2/h, which can be related to the residual density induced by the inhomogeneous charge distribution in the samples. The shape of the conductivity curves indicates that high mobility samples contain some short-range disorder whereas low mobility samples are dominated by long-range scatterers.

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  • Received 12 July 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.246803

©2007 American Physical Society

Authors & Affiliations

Y.-W. Tan1,*, Y. Zhang1,*, K. Bolotin1, Y. Zhao1, S. Adam2, E. H. Hwang2, S. Das Sarma2, H. L. Stormer1,3,4, and P. Kim1

  • 1Department of Physics, Columbia University, New York, New York 10027, USA
  • 2Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 3Department of Applied Physics, Columbia University, New York, New York 10027, USA
  • 4Bell Labs, Alcatel-Lucent Technologies, Murray Hill, New Jersey 07974, USA

  • *Current address: Department of Chemistry and Department of Physics, University of California at Berkeley, Berkeley, CA, USA.

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Vol. 99, Iss. 24 — 14 December 2007

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