Interferometer parameters that allow observation of non-Abelian e/4 properties.*

Fabry-Perot interferometers have been used to examine 5/2 filling factor, and have shown interference consistent with Abelian e/2 charges and non-Abelian e/4 charges. Simple magnetic field sweeps and independently side gate sweeps can each expose even-odd effects indicating non-Abelian e/4. These results have been compiled using a series of different heterostructure types, different illumination procedures, and different interferometer geometries, sizes, and gate charging procedures. In this talk summary results will be presented, but the focus will be these device parameters and procedures employed to reveal the non-Abelian properties. Central to this effort is the use of heterostructures that require illumination to produce high mobilities. The illumination and charging protocols exercised on different fundamental heterostructure types will be described, including the consequences, both good and bad, on 5/2 interference. Given these advantages and constraints on the 2D electron material systems, means to mitigate problems in the measurements by adjusting the interference devices themselves will be discussed.