Precision comparison of the quantum Hall effect in graphene and gallium arsenide

T. J B M Janssen, J. M. Williams, N. E. Fletcher, R. Goebel, A. Tzalenchuk, R. Yakimova, S. Lara-Avila, S. Kubatkin, V. I. Fal'Ko

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The half-integer quantum Hall effect in epitaxial graphene is compared with high precision to the well-known integer effect in a GaAs/AlGaAs heterostructure. We find no difference between the quantized resistance values within the relative standard uncertainty of our measurement of 8.7×10 11. The result places new tighter limits on any possible correction terms to the simple relation R K=h/e 2, and also demonstrates that epitaxial graphene samples are suitable for application as electrical resistance standards of the highest metrological quality. We discuss the characterization of the graphene sample used in this experiment and present the details of the cryogenic current comparator bridge and associated uncertainty budget.

    Original languageEnglish
    Pages (from-to)294-306
    Number of pages13
    JournalMetrologia
    Volume49
    Issue number3
    DOIs
    Publication statusPublished - Jun 2012

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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