Coulomb-Dominated Oscillations in Fabry–Perot Quantum Hall Interferometers

Periodic resistance oscillations in Fabry-Perot quantum Hall interferometers are observed at integer filling factors of the constrictions, f(c) = 1, 2, 3, 4, 5 and 6. Rather than the Aharonov-Bohm interference, these oscillations are attributed to the Coulomb interactions between interfering edge states and localized states in the central island of an interferometer, as confirmed by the observation of a positive slope for the lines of constant oscillation phase in the image plot of resistance in the B-V-S plane. Similar resistance oscillations are also observed when the area.. of the center regime and the backscattering probability of interfering edge states are varied, by changing the side-gate voltages and the configuration of the quantum point contacts, respectively. The oscillation amplitudes decay exponentially with temperature in the range of 40 mK < T <= 130 mK, with a characteristic temperature T-0 similar to 25 mK, consistent with recent theoretical and experimental works.