Good practice guide on the graphene-based AC-QHE realization of the farad

TL;DR

This paper provides a comprehensive guide for realizing the farad using graphene-based quantum Hall effect devices, detailing fabrication, cryogenic conditions, and calibration methods within a metrology context.

Contribution

It offers a detailed methodology for implementing the quantum Hall effect in graphene for precise capacitance standards, integrating digital impedance bridges and calibration procedures.

Findings

Successful fabrication of graphene quantum Hall devices

Implementation of digital impedance bridges for calibration

Achieved quantum Hall resistance quantization in graphene

Abstract

This Good Practice Guide provides information for the realization of the farad from the quantum Hall resistance in graphene devices by using digital impedance bridges. The fabrication and characterization of graphene quantum Hall effect devices, the cryogenic environment required to achieve the quantization conditions, the digital impedance bridges and calibration procedures are reported. The guide is a deliverable of the Joint Research Project EMPIR 18SIB07 GIQS: Graphene Impedance Quantum Standard. This project received funding from the European Metrology Programme for Innovation and Research (EMPIR) co-financed by the Participating States and from the European Unions' Horizon 2020 research and innovation programme. Funder ID: 10.13039/100014132 , Grant no: 18SIB07.