Quantised Hall effect and magnetoresistance through a quantum point contact
- 9 October 1989
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 1 (40) , 7499-7503
- https://doi.org/10.1088/0953-8984/1/40/025
Abstract
The four-terminal magnetoresistance and quantised Hall effect through a quantum point contact are investigated in a two-dimensional electron gas (2DEG) based on an n-type (AlGa)As/GaAs single heterostructure. Depending on the choice of current and voltage contacts we measure three different magnetoresistances in a quantising magnetic field. The results agree with a simple model based on conduction via edge states and also with a more conventional analysis based on the properties of a bulk 2DEG.Keywords
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