Magnetotransport through graphene nanoribbons at high magnetic fields

S. Minke, S. H. Jhang, J. Wurm, Y. Skourski, J. Wosnitza, C. Strunk, D. Weiss, K. Richter, and J. Eroms
Phys. Rev. B 85, 195432 – Published 15 May 2012

Abstract

We have investigated the magnetoresistance of lithographically prepared single-layer graphene nanoribbons in pulsed, perpendicular magnetic fields up to 60 T and performed corresponding transport simulations using a tight-binding model and several types of disorder. In experiment, at high carrier densities we observe Shubnikov-de Haas oscillations and the quantum Hall effect, while at low densities the oscillations disappear and an initially negative magnetoresistance becomes strongly positive at high magnetic fields. The strong resistance increase at very high fields and low-carrier densities is tentatively ascribed to a field-induced insulating state in the bulk graphene leads. Comparing numerical results and experiment, we demonstrate that at least edge disorder and bulk short-range impurities are important in our samples.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 17 November 2011

DOI:https://doi.org/10.1103/PhysRevB.85.195432

©2012 American Physical Society

Authors & Affiliations

S. Minke1,*, S. H. Jhang1, J. Wurm2, Y. Skourski3, J. Wosnitza3, C. Strunk1, D. Weiss1, K. Richter2, and J. Eroms1,†

  • 1Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany
  • 2Institute of Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany
  • 3Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany

  • *née S. Schmidmeier.
  • jonathan.eroms@physik.uni-regensburg.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 85, Iss. 19 — 15 May 2012

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×