The Consultative Committee for Electricity and Magnetism (CCEM) has published a new guide supporting the characterization and reliable use of graphene-based quantum Hall devices for measurements of the quantized Hall resistance.

Published in Metrologia as a “Guide, Standard and Convention”, the document provides practical guidance for laboratories working with graphene-based devices and is expected to become an important reference for the electrical metrology community.

Background

Graphene-based quantum Hall devices have attracted increasing interest because they can operate at lower magnetic fields and higher temperatures than traditional gallium arsenide (GaAs)-based devices. These operating conditions facilitate the use of more compact cryomagnet systems and are expected to support wider deployment of primary resistance standards based on the quantum Hall effect.

The new guide builds on the CCEM’s long-established technical guidelines for reliable measurements of the quantized Hall resistance, adapting them to the specific characteristics of epitaxial graphene devices. It provides guidance on device characterization, performance verification and measurement considerations, to support reliable and consistent use.