Plateau flatness in the ACQHR: do gates really help?

Author

Inglis, A.D. ; Wood, B.M. ; Côté, M. ; Young, R.B. ; Early, M.D.

Author_Institution

Inst. for Nat. Meas. Stand., Nat. Res. Council, Ottawa, Ont., Canada

Volume

52

Issue

2

fYear

2003

fDate

4/1/2003 12:00:00 AM

Firstpage

569

Lastpage

573

Abstract

We describe audio frequency measurements of quantum Hall resistors mounted with and without back-gates. We show that by gating the devices, flat plateaux can be obtained, but this can also lead to ambiguities in the measured Hall values. The current dependence of the Hall resistance also varies with the gate voltage, but the criteria of (a) a flat plateau and (b) zero current dependence are not equivalent. This emphasises the need to establish rigorous and fundamental criteria before AC resistance values can be based directly on the quantum Hall effect.

Keywords

bridge circuits; electric current; electric resistance measurement; measurement standards; quantum Hall effect; AC bridges; AC quantum Hall resistance; AC resistance; ACQHR plateau flatness; Hall resistance current dependence; audio frequency measurements; measured Hall value ambiguities; quantum Hall effect; quantum Hall resistors; resistor back-gates; Bridge circuits; Electrical resistance measurement; Frequency measurement; Hall effect; Laboratories; Magnetic field measurement; Measurement standards; Probes; Reproducibility of results; Standards development;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2003.810453

Filename

1202099