Fig. 1: Interferometer at the ν = 1/3 fractional quantum Hall state.
a SEM image of interferometer with false color. Yellow regions are the gates that define the interference path. Blue regions correspond to the 2DES. There is a center gate in the middle which is kept grounded and does not affect the 2DES density. Red lines indicate edge state trajectories, with backscattered paths denoted by dashed lines. b Bulk Rxy measurement showing the ν = 1/3 conductance plateau. The approximate positions in magnetic field where the interferometer transitions from negatively sloped Aharonov–Bohm behavior to flat lines of constant phase with Φ0 modulations are marked with dashed lines. c Interference at ν = 1/3 at a mixing chamber temperature of 10 mK. Near the center there are several discrete jumps in phase which are associated with removal of quasiparticles localized by disorder in the interior of the interferometer. At high and low field the lines of constant phase become nearly independent of magnetic field, but modulations with period approximately Φ0 can be seen. These modulations are more prominent in the high-field region, particularly close to the transition point at approximately 7.7 T.
