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Graphene, universality of the quantum Hall effect and redefinition of the SI system

Research output: Contribution to journalJournal article


  • T. J. B. M. Janssen
  • N. E. Fletcher
  • R. Goebel
  • J. M. Williams
  • A. Tzalenchuk
  • R. Yakimova
  • S. Kubatkin
  • S. Lara-Avila
  • V. I. Falko
Article number093026
Journal publication date16/09/2011
JournalNew Journal of Physics
Number of pages7
Original languageEnglish


The Systeme Internationale d'unites (SI) is about to undergo its biggest change in half a century by redefining the units for mass and current in terms of the fundamental constants h and e, respectively. This change crucially relies on the exactness of the relationships that link these constants to measurable quantities. Here we report the first direct comparison of the integer quantum Hall effect (QHE) in epitaxial graphene with that in GaAs/AlGaAs heterostructures. We find no difference in the quantized resistance value within the relative standard uncertainty of our measurement of 8.6 x 10(-11), this being the most stringent test of the universality of the QHE in terms of material independence.

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