Distinct Signatures For Coulomb Blockade and Aharonov-Bohm Interference in Electronic Fabry-Perot Interferometers*

Two different types of resistance oscillations are observed in two electronic Fabry-Perot interferometers of different sizes. Measuring these oscillations as a function of magnetic field, gate voltage, or both, we observe three signatures that distinguish the two types. The oscillations observed in a $2~\mathrm{\mu m^2}$ device are understood to arise from Coulomb blockade, and those observed in an $18~\mathrm{\mu m^2} $ device from Aharonov-Bohm interference. This work clarifies, provides ways to distinguish, and demonstrates control over, the physical origins of resistance oscillations seen in electronic Fabry-Perot interferometers.