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

Janssen, T J B M; Fletcher, N E*; Goebel, R*; Williams, J M; Tzalenchuk, A; Yakimova, R*; Kubatkin, S*; Lara-Avila, S*; Falko, V I* (2011) Graphene, universality of the quantum Hall effect and redefinition of the SI system. New J. Phys., 13. 093026

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Abstract

The Système Internationale d'unités (SI system) 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 which link these constants to measurable quantities. Here we report the first direct comparison of the integer quantum Hall effect in epitaxial graphene with that in GaAs/AlGaAs heterostructures. We find no difference of the quantized resistance value within the relative standard uncertainty of our measurement of 8.6×10-11, being the most stringent test of the universality of the quantum Hall effect in terms of material independence.

Item Type: Article
Keywords: graphene, SI system, quantum Hall effect
Subjects: Quantum Phenomena
Quantum Phenomena > Nanophysics
Identification number/DOI: 10.1088/1367-2630/13/9/093026
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5262

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