THE TOPOLOGICAL TRANSITION FROM A CORBINO TO HALL BAR GEOMETRY

Authors
SACHRAJDA AS FENG Y TAYLOR RP NEWBURY R COLERIDGE PT MCCAFFREY JP
Citation
As. Sachrajda et al., THE TOPOLOGICAL TRANSITION FROM A CORBINO TO HALL BAR GEOMETRY, Superlattices and microstructures, 20(4), 1996, pp. 651-656
Citations number
5
Categorie Soggetti
Physics, Condensed Matter
Journal title
Superlattices and microstructures → ACNP
ISSN journal
07496036
Volume
20
Issue
4
Year of publication
1996
Pages
651 - 656
Database
ISI
SICI code
0749-6036(1996)20:4<651:TTTFAC>2.0.ZU;2-R
Abstract
We have fabricated a device which can be transformed from a Corbino to a two terminal Hall bar geometry by the activation of a single electr ostatic gate. The behaviour in the Hall bar mode is both quantitativel y and qualitatively in disagreement with predictions of the Landauer-B uttiker formula. The origin of the disagreement relates to the 'ideal contact' assumption implicit in the Landauer-Buttiker formula which br eaks down under the novel conditions of this experiment.