Abstract :
The edge states in the quantum Hall regime are forced to interfere on one side of an Aharonov–Bohm ring by a potential barrier. The net effect of the interference caused by the potential barrier is found to change the electronʹs phase by Δ in the final transmittance, and the phase shift Δ is continuous as the barrier potential is continuously changed. This result is in sharp contrast with the earlier study that Δ=2nπ, where n is an integer, regardless of the barrier potential.
