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

Weak localization in graphene flakes.

F V Tikhonenko1, D W Horsell, R V Gorbachev

  • 1School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, United Kingdom.

Physical Review Letters
|March 21, 2008
PubMed
Summary
This summary is machine-generated.

Quantum interference in graphene differs from other 2D systems due to chiral carriers. Both elastic and inelastic scattering significantly impact weak localization in graphene flakes.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Quantum interference phenomena are crucial for understanding electron transport in low-dimensional materials.
  • Graphene, a unique two-dimensional material, exhibits distinct electronic properties due to its chiral charge carriers.
  • Conventional two-dimensional systems show quantum interference primarily influenced by inelastic scattering.

Purpose of the Study:

  • To investigate the unique manifestation of quantum interference in graphene.
  • To analyze the influence of both elastic and inelastic scattering on weak localization in graphene.
  • To determine the characteristic rates governing weak localization and their dependence on graphene sample properties.

Main Methods:

  • Studying weak localization in various graphene samples.
  • Conducting measurements across different carrier densities, including the Dirac point.
  • Analyzing the impact of graphene flake shape and quality on scattering rates.

Main Results:

  • Graphene's quantum interference is highly sensitive to elastic scattering, unlike conventional systems.
  • Characteristic elastic and inelastic scattering rates determining weak localization were identified.
  • A correlation was established between graphene flake morphology and the measured scattering rates.

Conclusions:

  • The chiral nature of charge carriers in graphene fundamentally alters quantum interference effects.
  • Both elastic and inelastic scattering processes are critical for understanding weak localization in graphene.
  • Graphene sample characteristics play a significant role in modulating these scattering mechanisms.