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Related Experiment Video

Updated: Jul 10, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Published on: July 24, 2015

Electron scattering on microscopic corrugations in graphene.

M I Katsnelson1, A K Geim

  • 1Institute for Molecules and Materials, Radboud University of Nijmegen, Toernooiveld 1, Nijmegen, The Netherlands. katsnelson@science.ru.nl

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 21, 2007
PubMed
Summary

Scattering from neutral impurities has minimal impact on graphene

Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Single-layer graphene exhibits unique electronic properties due to Dirac fermions.
  • Understanding scattering mechanisms is crucial for optimizing graphene's electronic quality.
  • Charged impurities and ripples are known to affect graphene's conductivity.

Purpose of the Study:

  • To investigate various scattering mechanisms affecting Dirac fermions in single-layer graphene.
  • To differentiate the impact of short-range versus long-range scattering potentials.
  • To explain experimental observations of charge-carrier mobility in graphene.

Main Methods:

  • Theoretical analysis of scattering potentials in graphene.
  • Modeling of scattering by neutral impurities, charged impurities, and ripples.

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  • Comparison of theoretical predictions with experimental data on charge-carrier mobility.

    • Main Results:

    • Scattering from short-range potentials (neutral impurities) is found to be largely irrelevant for graphene's electronic quality.
    • Charged impurities and ripples are identified as dominant factors controlling graphene's electronic properties.
    • Certain types of ripples create long-range scattering potentials, mimicking Coulomb scatterers.

    Conclusions:

    • Graphene's electronic quality is primarily determined by charged impurities and inherent ripples.
    • Ripples significantly influence the electron mean-free path and can lead to mobility independent of carrier concentration.
    • The findings align with experimental observations, providing insights into graphene's charge-carrier behavior.