Magnetoresistance in Disordered Graphene: The Role of Pseudospin and Dimensionality Effects Unraveled
arXiv:1101.4754 · doi:10.1209/0295-5075/94/47006
Abstract
We report a theoretical low-field magnetotransport study unveiling the effect of pseudospin in realistic models of weakly disordered graphene-based materials. Using an efficient Kubo computational method, and simulating the effect of charges trapped in the oxide, different magnetoconductance fingerprints are numerically obtained in system sizes as large as 0.3 micronmeter squared, containing tens of millions of carbon atoms. In two-dimensional graphene, a strong valley mixing is found to irreparably yield a positive magnetoconductance (weak localization), whereas crossovers from positive to a negative magnetoconductance (weak antilocalization) are obtained by reducing disorder strength down to the ballistic limit. In sharp contrast, graphene nanoribbons with lateral size as large as 10nm show no sign of weak antilocalization, even for very small disorder strength. Our results rationalize the emergence of a complex phase diagram of magnetoconductance fingerprints, shedding some new light on the microscopical origin of pseudospin effects.
8 pages, 5 figures
References in corpus (19)
- The electronic properties of graphene
- Half-Metallic Graphene Nanoribbons
- Chiral tunneling and the Klein paradox in graphene
- Weak localisation magnetoresistance and valley symmetry in graphene
- Quantum Hall Ferromagnetism in Graphene
- Weak localisation in graphene flakes
- Intervalley scattering, long-range disorder, and effective time reversal symmetry breaking in graphene
- Weak antilocalization in epitaxial graphene: evidence for chiral electrons
- Strain-induced pseudo-magnetic field for novel graphene electronics
- Electron Beam Supercollimation in Graphene Superlattices
- Perfectly Conducting Channel and Universality Crossover in Disordered Nano-Graphene Ribbons
- Localization and Kosterlitz-Thouless Transition in Disordered Graphene
- Colossal negative magnetoresistance in dilute fluorinated graphene
- Magneto-transport in Disordered Graphene: from Weak Localization to Strong Localization
- Spin and the Honeycomb Lattice: Lessons from Graphene
- Chemically-induced Mobility Gaps in Graphene Nanoribbons: A Route for Upscaling Device Performances
- Current Status of Graphene Transistors
- Edge Magneto-Fingerprints in Disordered Graphene Nanoribbons
- Time reversal of pseudo-spin 1/2 degrees of freedom
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- Quantum Transport in Chemically-modified Two-Dimensional Graphene: From Minimal Conductivity to Anderson Localization
- Valley-Polarized Quantum Transport Generated by Gauge Fields in Graphene
- Quantum Hall effect in polycrystalline graphene: The role of grain boundaries
- Splitting of the Zero-Energy Landau Level and Universal Dissipative Conductivity at Critical Points in Disordered Graphene
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- Charge and Spin Transport Anisotropy in Nanopatterned Graphene
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- Partial preservation of chiral symmetry and colossal magnetoresistance in adatom doped graphene
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