Unveiling the Magnetic Structure of Graphene Nanoribbons

Rebeca Ribeiro, Jean-Marie Poumirol, Alessandro Cresti, Walter Escoffier, Michel Goiran, Jean-Marc Broto, Stephan Roche, and Bertrand Raquet
Phys. Rev. Lett. 107, 086601 – Published 19 August 2011
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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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  • Received 7 February 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.086601

© 2011 American Physical Society

Authors & Affiliations

Rebeca Ribeiro1, Jean-Marie Poumirol1, Alessandro Cresti2, Walter Escoffier1, Michel Goiran1, Jean-Marc Broto1, Stephan Roche3,4, and Bertrand Raquet1

  • 1Laboratoire National des Champs Magnétiques Intenses, INSA UPS UJF CNRS, UPR 3228, Université de Toulouse, 143 av. de Rangueil, 31400 Toulouse, France
  • 2IMEP-LAHC (UMR CNRS/INPG/UJF 5130), Grenoble INP Minatec, 3 Parvis Louis Néel, BP 257, F-38016 Grenoble, France
  • 3CIN2 (ICN-CSIC) and Universitat Autonoma de Barcelona, Catalan Institute of Nanotechnology, Campus de la UAB, 08193 Bellaterra (Barcelona), Spain
  • 4ICREA, Institucio Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain

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Issue

Vol. 107, Iss. 8 — 19 August 2011

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