Quantum Hall Effect in Hydrogenated Graphene

Abstract

The quantum Hall effect is observed in a two-dimensional electron gas formed in millimeter-scale hydrogenated graphene, with a mobility less than 10 $\mathrm{c}{\mathrm{m}}^2/V\cdot \mathrm{s}$ and corresponding Ioffe-Regel disorder parameter $(k_F\lambda {)}^{-1}\gg 1$. In zero magnetic field and low temperatures, the hydrogenated graphene is insulating with a two-point resistance of order of $250h/e^2$. Application of a strong magnetic field generates a negative colossal magnetoresistance, with the two-point resistance saturating within 0.5% of $h/2e^2$ at 45T. Our observations are consistent with the opening of an impurity-induced gap in the density of states of graphene. The interplay between electron localization by defect scattering and magnetic confinement in two-dimensional atomic crystals is discussed.

4 pages, 4 figures + supplemental info

References in corpus (10)

• Electric Field Effect in Atomically Thin Carbon Films
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
• Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
• Control of graphene's properties by reversible hydrogenation
• Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
• Landau Level Splitting in Graphene in High Magnetic Fields
• Multicomponent fractional quantum Hall effect in graphene
• Spin and valley quantum Hall ferromagnetism in graphene
• Colossal negative magnetoresistance in dilute fluorinated graphene

Cited by in corpus (9)

• Spin Transport in Hydrogenated Graphene
• Quantum Hall effect in polycrystalline graphene: The role of grain boundaries
• Unconventional Features in the Quantum Hall Regime of Disordered Graphene: Percolating Impurity States and Hall Conductance Quantization
• Efficient Linear Scaling Approach for Computing the Kubo Hall Conductivity
• Quantum transport in chemically functionalized graphene at high magnetic field: Defect-Induced Critical States and Breakdown of Electron-Hole Symmetry
• Measurement of Topological Berry Phase in Highly Disordered Graphene
• Impurities and electronic localization in graphene bilayers
• Partial preservation of chiral symmetry and colossal magnetoresistance in adatom doped graphene
• Large magnetoresistance by Pauli blockade in hydrogenated graphene