The fractional quantum Hall states are predicted to host exotic quasiparticles carrying fractional charge and obeying anyonic braiding statistics. It has been proposed that these properties may be observed through interference experiments. Our efforts focus on fabricating electronic Fabry-Perot interferometers on ultra-high quality GaAs wafers in order to probe fractional charge and statistics. Devices are measured at cryogenic temperatures (T~15mK).  We have operated devices in both the pure Aharonov-Bohm and the Coulomb blockade regimes at integer quantum Hall states, and we are working to extend these experiments to the fractional quantum Hall regime.


Oscillations across the interferometer as a function of magnetic field and side gate voltage. The lines of constant phase have negative slope, characteristic of Aharonov-Bohm interference.