Unveiling the Landau Levels Structure of Graphene Nanoribbons

Abstract

Magnetotransport measurements are performed in ultraclean (lithographically patterned) graphene nanoribbons down to 70 nm. At high magnetic fields, a fragmentation of the electronic spectrum into a Landau levels pattern with unusual features is unveiled. The singular Landau spectrum reveals large magneto-oscillations of the Fermi energy and valley degeneracy lifting. Quantum simulations suggest some disorder threshold at the origin of mixing between opposite chiral magnetic edge states and disappearance of quantum Hall effect.

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Cited by in corpus (14)

• Electronic and optical properties of graphene nanoribbons in external fields
• Characterizing wave functions in graphene nanodevices: electronic transport through ultrashort graphene constrictions on a boron nitride substrate
• Crossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons
• Aharonov-Bohm effect and giant magnetoresistance in graphene nanoribbon rings
• Conductance quantization in graphene nanoconstrictions with mesoscopically smooth but atomically stepped boundaries
• Graphene nanoribbons: relevance of etching process
• Magnetotransport through graphene nanoribbons at high magnetic fields
• Spin polarization and g-factor enhancement in graphene nanoribbons in magnetic field
• Edge state transport through disordered graphene nanoribbons in the quantum Hall regime
• Quenching of the quantum Hall effect in graphene with scrolled edges
• Quantum Hall effect in narrow graphene ribbons
• High-field magnetoresistance revealing scattering mechanisms in graphene
• Geometric magnetoconductance dips by edge roughness in graphene nanoribbons
• Magnetic quantization in multilayer graphenes