Accurate graphene quantum Hall arrays for the new International System of Units.

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 I_C ~ 100 μA. Here we present experiments on quantization accuracy of a 236-element quantum Hall array (QHA), demonstrating R_K/236 ≈ 109 Ω with 0.2 part-per-billion (nΩ/Ω) accuracy with I_C ≥ 5 mA (~1 nΩ/Ω accuracy for I_C = 8.5 mA), using epitaxial graphene on silicon carbide (epigraphene). The array accurac

SUBMITTER: He H 

PROVIDER: S-EPMC9663594 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature