Abstract
The spatial distribution of heat dissipation in quantum Hall-effect devices was imaged utilizing the fountain pressure effect of superfluid helium. This was done by observing visually the local thickness of a helium film covering the sample. We found that dissipation takes place only in two opposite corners at the current contacts. Unexpected asymmetries between the two corners were observed if the Hall currents exceeded a threshold value. In a Corbino geometry the breakdown of the quantum Hall effect was imaged and spiral-shaped filaments were observed.
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