Examining high quality 2D-heterostructures and their potential for hosting non-Abelian anyons

Past measurements on high electron density, high mobility heterostructures using Fabry-Perot interferometers have shown interference oscillations at 7/2 and 5/2 filling factors that are consistent with even-odd oscillations, a property of non-Abelian excitations there [1].  Even-odd oscillations are a consequence of the e/4 number parity systematically changing in the interferometer as B-field is swept, and are due to the fermion parity preservation or change when braiding an even or odd number of e/4 quasiparticles respectively. The magnitude of these oscillations specific to the non-Abelian properties is different for different heterostructure constructions, correlated with varied methods applied during their construction to improve material quality. Additionally, an important part of the sample preparation is illumination of the device which provides persistent photocurrent.  Here we will present details on these sample constructions and illumination processes and their impact on the non-Abelian specific measured effects. These details will include measurements using our expanded interferometer device fabrication capabilities and greatly expanded refrigeration utilities, each with their own positive and negative attributes in these specific measurements.

[1] R.L. Willett et al. Interference measurements of non-Abelian e/4 & Abelian e/2 quasiparticle braiding, Physical Review X 13 (2023).