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In quantum Hall systems with two narrow constrictions, tunneling betweenopposite edges can give rise to quantum interference and Aharonov-Bohm-likeoscillations of the conductance. When there is an integer quantized Hall statewithin the constrictions, a region between them, with higher electron density,may form a compressible island. Electron-tunneling through this island can leadto residual transport, modulated by Coulomb-blockade type effects. We find thatthe coupling between the fully occupied lower Landau levels and thehigher-partially occupied level gives rise to flux subperiods smaller than oneflux quantum. We generalize this scenario to other geometries and to fractionalquantum Hall systems, and compare our predictions to experiments.Comment: 4 + epsilon pages, 3 figure

Influence of Interactions on Flux and Back-Gate Period of Quantum Hall Interferometers