Magnetic field-tuned Aharonov-Bohm oscillations and evidence for non-Abelian anyons at v=5/2

TL;DR

This study provides experimental evidence for non-Abelian anyons at the v=5/2 quantum Hall state by observing magnetic field oscillations consistent with Ising-type non-Abelian statistics in interferometers.

Contribution

First experimental demonstration of non-Abelian anyon signatures at v=5/2 using magnetic field-tuned Aharonov-Bohm oscillations in quantum Hall interferometers.

Findings

Resistance oscillations at v=5/2 match non-Abelian predictions.

Oscillation periods differ from Abelian states, indicating non-Abelian statistics.

Evidence supports the presence of Ising-type non-Abelian anyons.

Abstract

We show that the resistance of the v=5/2 quantum Hall state, confined to an interferometer, oscillates with magnetic field consistent with an Ising-type non-Abelian state. In three quantum Hall interferometers of different sizes, resistance oscillations at v=7/3 and integer filling factors have the magnetic field period expected if the number of quasiparticles contained within the interferometer changes so as to keep the area and the total charge within the interferometer constant. Under these conditions, an Abelian state such as the (3,3,1) state would show oscillations with the same period as at an integer quantum Hall state. However, in an Ising-type non-Abelian state there would be a rapid oscillation associated with the "even-odd effect" and a slower one associated with the accumulated Abelian phase due to both the Aharonov-Bohm effect and the Abelian part of the quasiparticle braiding statistics. Our measurements at v=5/2 are consistent with the latter.