Unveiling the magnetic structure of graphene nanoribbons |
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Authors: | Ribeiro Rebeca Poumirol Jean-Marie Cresti Alessandro Escoffier Walter Goiran Michel Broto Jean-Marc Roche Stephan Raquet Bertrand |
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Institution: | Laboratoire National des Champs Magnétiques Intenses, INSA UPS UJF CNRS, UPR 3228, Université de Toulouse, 143 av. de Rangueil, 31400 Toulouse, France. |
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Abstract: | We perform magnetotransport measurements in lithographically patterned graphene nanoribbons down to a 70 nm width. The electronic spectrum fragments into an unusual Landau levels pattern, characteristic of Dirac fermion confinement. The two-terminal magnetoresistance reveals the onset of magnetoelectronic subbands, edge currents and quantized Hall conductance. We bring evidence that the magnetic confinement at the edges unveils the valley degeneracy lifting originating from the electronic confinement. Quantum simulations suggest some disorder threshold at the origin of mixing between chiral magnetic edge states and disappearance of quantum Hall effect. |
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