Graphene, universality of the quantum Hall effect and redefinition of the SI system
Artikel i vetenskaplig tidskrift, 2011

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.

resistance standard

Författare

Tjbm Janssen

National Physical Laboratory

N. E. Fletcher

BIPM Bureau International des Poids et Mesures

R. Goebel

BIPM Bureau International des Poids et Mesures

J. M. Williams

National Physical Laboratory

A.Y. Tzalenchuk

National Physical Laboratory

R. Yakimova

Linköpings universitet

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Samuel Lara Avila

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

V. I. Fal'ko

Lancaster University

New Journal of Physics

1367-2630 (ISSN)

Vol. 13 093026

Ämneskategorier

Fysik

DOI

10.1088/1367-2630/13/9/093026