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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Strong suppression of weak localization in graphene
S V Morozov1, K S Novoselov, M I Katsnelson
1Department of Physics, University of Manchester, Manchester M13 9PL, United Kingdom.
Physical Review Letters
|August 16, 2006
Summary
Weak-localization magnetoresistance is suppressed in graphene due to sheet corrugations. These mesoscopic irregularities cause dephasing, mimicking a random magnetic field effect.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Low-field magnetoresistance is a common phenomenon in low-dimensional metals.
- It typically arises from quantum interference on diffusive paths.
Purpose of the Study:
- Investigate the behavior of weak-localization magnetoresistance in graphene.
- Understand the reasons behind its suppression or absence in this material.
Main Methods:
- Experimental observation of magnetoresistance in graphene samples.
- Theoretical analysis of quantum interference and dephasing effects.
Main Results:
- Weak-localization magnetoresistance is significantly suppressed in graphene.
- In some cases, the magnetoresistance effect is entirely absent.
- Mesoscopic corrugations on graphene sheets were identified as the cause.
Conclusions:
- Graphene's unique properties, specifically its sheet corrugations, alter magnetoresistance phenomena.
- These corrugations induce a dephasing effect, suppressing weak-localization magnetoresistance.
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