Quantum resistance metrology in graphene
- High Field Magnet Laboratory, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 7, 6525 ED Nijmegen (Netherlands)
- NMi Van Swinden Laboratorium BV, Thijsseweg 11, 2629 JA Delft (Netherlands)
- Department of Physics, University of Manchester, M13 9PL Manchester (United Kingdom)
We performed a metrological characterization of the quantum Hall resistance in a 1 {mu}m wide graphene Hall bar. The longitudinal resistivity in the center of the {nu}={+-}2 quantum Hall plateaus vanishes within the measurement noise of 20 m{omega} up to 2 {mu}A. Our results show that the quantization of these plateaus is within the experimental uncertainty (15 ppm for 1.5 {mu}A current) equal to that in conventional semiconductors. The principal limitation of the present experiments is the relatively high contact resistances in the quantum Hall regime, leading to a significantly increased noise across the voltage contacts and a heating of the sample when a high current is applied.
- OSTI ID:
- 21175796
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 22 Vol. 93; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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