Abstract
We have investigated the current distribution at quantum Hall effect (QHE) plateau to study mechanisms of the QHE breakdown whose critical current shows sub‐linear dependence on the channel width. A Hall‐bar device made from GaAs/AlGaAs on a scanning stage is locally illuminated by an infrared laser light to map the QHE breakdown critical current with local photo‐excitation. The spatial profile of the critical current reveals the current concentration at the center region of the sample.
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