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Weak localization in graphene: theory, simulations, and experiments.

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This study unifies weak and strong localization in graphene monolayers, revealing a minimum in localization length similar to conductivity minimums. Magnetotransport in graphene devices is comprehensively analyzed.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Magnetotransport phenomena in graphene are crucial for understanding its electronic properties.
  • Localization effects, including weak and strong, significantly impact graphene device performance.

Purpose of the Study:

  • To provide a comprehensive analysis of magnetotransport in graphene monolayers under nonquantizing magnetic fields.
  • To investigate the interplay of two-carrier transport, weak localization, weak antilocalization, and strong localization.
  • To establish a unified framework connecting weak and strong localization phenomena.

Main Methods:

  • Theoretical modeling of magnetotransport phenomena.
  • Experimental measurements on various graphene devices (different substrates, mobilities).
  • Numerical simulations to validate theoretical and experimental findings.

Main Results:

  • Observation of a minimum in weak localization and strong localization length, mirroring the conductivity minimum.
  • Demonstration of a unified framework explaining both weak and strong localization in graphene.
  • Remarkable agreement found between theoretical predictions, experimental data, and numerical simulations.

Conclusions:

  • The study establishes a unified understanding of localization in graphene.
  • The observed minimum in localization length provides a key link between different localization regimes.
  • The findings are robust across various graphene device configurations and mobilities.