Year: 2022
Type: article
Abstract: Graphene quantum Hall effect (QHE) resistance standards have the potential to provide superior realizations of three key units in the new International System of Units (SI): the ohm, the ampere, and the kilogram (Kibble Balance). However, these prospects require different resistance values than practically achievable in single graphene devices (~12.9 kΩ), and they need bias currents two orders of magnitude higher than typical breakdown currents IC ~ 100 μA. Here we present experiments on quantization accuracy of a 236-element quantum Hall array (QHA), demonstrating RK/236 ≈ 109 Ω with 0.2 part-per-billion (nΩ/Ω) accuracy with IC ≥ 5 mA (~1 nΩ/Ω accuracy for IC = 8.5 mA), using epitaxial graphene on silicon carbide (epigraphene). The array accuracy, comparable to the most precise universality tests of QHE, together with the scalability and reliability of this approach, pave the road for wider use of graphene in the new SI and beyond.
Source: Nature Communications
Authors: Hans He, Karin Cedergren, Naveen Shetty, Samuel Lara-Avila, Sergey Kubatkin, Tobias Bergsten, Gunnar Eklund
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,890
Awards: G4267627264, G4355223727, SUGAR - Superconducting Graphene Arrays, Graphene ac metrology - Realization of the resistance unit at ac (GaMe), Epitaxiell grafen för metrologi, sensorer och elektronik, 2D material-based technology for industrial applications (2D-TECH), G7783276837, Nya tvådimensionella system från tillväxt till tillämpningar
OpenAlex ID: W4308992121