Aharonov-Bohm interferometer based on n-p junction in graphene nanoribbons

TL;DR

This paper presents a graphene-based Aharonov-Bohm interferometer utilizing n-p junctions at high magnetic fields, enabling quantum interference through current confinement and edge coupling.

Contribution

It introduces a novel interferometer design based on n-p junctions in graphene nanoribbons, exploiting quantum Hall effects for interference.

Findings

Interference achieved via closed n-p junctions induced by floating gates

Operation depends on current splitting at edges and junction contacts

Device functions at low Fermi energy in armchair ribbons

Abstract

We demonstrate that the phenomenon of current confinement along graphene n-p junctions at high magnetic fields can be used to form an Aharonov-Bohm interferometer. The interference system exploits a closed n-p junction that can be induced by a floating gate within the sample, and coupling of the junction currents with the edge currents in the quantum Hall regime. Operation of the device requires current splitting at the edge and the n-p junction contacts which is found for armchair ribbons at low Fermi energy.