Current-voltage characteristics of graphene devices: Interplay between Zener-Klein tunneling and defects

Niels Vandecasteele, Amelia Barreiro, Michele Lazzeri, Adrian Bachtold, and Francesco Mauri
Phys. Rev. B 82, 045416 – Published 20 July 2010

Abstract

We report a theoretical/experimental study of current-voltage characteristics (IV) of graphene devices near the Dirac point. The IV can be described by a power law (IVα with 1<α1.5). The exponent is higher when the mobility is lower. This superlinear IV is interpreted in terms of the interplay between Zener-Klein transport, that is tunneling between different energy bands, and defect scattering. Surprisingly, the Zener-Klein tunneling is made visible by the presence of defects.

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  • Received 2 October 2009

DOI:https://doi.org/10.1103/PhysRevB.82.045416

©2010 American Physical Society

Authors & Affiliations

Niels Vandecasteele1, Amelia Barreiro2,*, Michele Lazzeri1, Adrian Bachtold2, and Francesco Mauri1

  • 1IMPMC, IPGP, Universités Paris 6 et 7–CNRS, 140 rue de Lourmel, 75015 Paris, France
  • 2CIN2, CSIC-ICN, Campus UAB, E-08193 Barcelona, Spain

  • *Present address: Kavli Institute of Nanoscience Delft, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.

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Vol. 82, Iss. 4 — 15 July 2010

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