Quantum Hall effect in a two-dimensional electron system bent by 90°

Using a new MBE growth technique, we fabricate a two-dimensional electron system which is bent around an atomically sharp 90degrees corner. In the quantum Hall regime under tilted magnetic fields, we can measure equilibration between both co- and counter-propagating edge channels of arbitrary filling factor ratio. We present here 4-point-magnetotransport characterization of the comer junction with unequal filling factor combinations which can all be explained using the standard Landauer-Buttiker edge channel picture. The success of this description confirms the realization of the first non-planar quantum Hall edge geometry. (C) 2003 Elsevier B.V. All rights reserved.