Abstract
We report on the bend resistance in junctions of crossed wires in the quantum Hall regime. The vanished resistance associated with the ν = 1 quantum Hall state becomes negative for the filling factor ν just below unity when the channel width is reduced. The negative resistance dip is independent of temperature in the measured range of 0.08–0.9 K. Although these features indicate the interboundary scattering between the ν = 1 edge states to be the origin, simple single-particle models fail to reproduce the negative resistance because of the cancellation of the change in the transmission probabilities caused by the scattering.
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