Plateau flatness in the ACQHR: do gates really help?

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2003-04, Vol.52 (2), p.569-573
Main Authors: Inglis, A.D., Wood, B.M., Cote, M., Young, R.B., Early, M.D.
Format: Article
Language:English
Subjects:
Bridge circuits
Criteria
Electrical resistance measurement
Equivalence
Frequency measurement
Gates
Gating and risering
Hall effect
Halls
Laboratories
Magnetic field measurement
Measurement standards
Probes
Quantum Hall effect
Reproducibility of results
Resistors
Standards development
Voltage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2003.810453