Graphene Quantum Point Contact for Quantum Hall Interferometry

Anyons are particles which possess exchange properties beyond the typical bosonic and fermionic quantum statistics. Several varieties of anyons are expected to emerge as quasi-particles in the regime of the fractional quantum Hall effect (FQHE) where strong magnetic fields are applied on a 2-dimensional electron gas with strong electron-electron interactions. Traditionally, experiments in GaAs heterostructures have attempted to demonstrate anyonic exchange properties via quantum Hall interferometry, but results remain inconclusive. Recently, graphene based heterostructures have emerged as an alternative platform for studying these exotic anyonic quasi-particles within several robust FQHE phases that show larger gaps, particularly in even-denominator states. Here we present preliminary results utilizing hBN-encapsulated monolayer graphene with top and bottom graphite gates to electrostatically define interferometers in the FQHE regime. We will present a quantum point contact (QPC) that functions in the quantum Hall regime, a necessary ingredient for interferometers, and several devices that we characterize through transport measurements at cryogenic temperatures and strong magnetic field.