Anomalous Aharonov-Bohm Interference in the Presence of Edge Reconstruction

Abstract

Interferometry is a vital tool for studying fundamental features in the quantum Hall effect (QHE). For instance, Aharonov-Bohm (AB) interference in a quantum Hall interferometer can probe the wave-particle duality of electrons and quasiparticles. Here, we report an unusual AB interference in a quantum Hall Fabry-Pérot interferometer (FPI), whose Coulomb interactions were suppressed with a grounded drain in the interior bulk of the FPI. In a descending filling factor from $\nu =3$ to $\nu \approx 5/3$, the magnetic field periodicity, which corresponded to a single 'flux quantum,' agreed accurately with the enclosed area of the FPI. However, in the filling range, $\nu \approx 5/3$ to $\nu =1$, the field periodicity increased markedly, apriori suggesting a drastic shrinkage of the AB area. Moreover, the modulation gate voltage periodicity decreased abruptly at this range. We attribute these unexpected observations to a ubiquitous edge reconstruction, leading to dynamical area changing with the field and a modified modulation gate-edge capacitance. These results are reproducible and support future interference experiments with a QHE-FPI.

23 pages, 12 figures, Supplementary Information

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Cited by in corpus (4)

• Dissipation and dephasing in quantum Hall interferometers
• Thermal junctions controlled with Aharonov-Bohm phases
• Edge reconstruction of compressible Quantum Hall fluid in the filling fraction range 1/3 to 2/3
• Collapse of edge reconstruction in compressible Quantum Hall fluid within filling fraction range 2/3 to 1