Magnetic flux periodic conductance modulations in mesoscopic two-paths quantum Hall devices

L. Schulz, J. Weis, and K. v. Klitzing
Two-paths quantum Hall devices have been discussed in literature in terms of the edge-state picture as electronic interferometers. Our recent experimental investigations on a versatile mesoscopic quantum Hall device with in-situ tunable different combinations of parallel current paths shows in all combinations periodic conductance modulations in the applied magnetic flux. Certain observed features contradict interference as underlying mechanism, but are naturally explained in our microscopic picture of the quantum Hall effect derived from scanning probe experiments.

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