Suppression of decoherence in a graphene monolayer ring

TL;DR

This paper demonstrates that high magnetic fields can suppress decoherence in a graphene monolayer ring, enhancing quantum coherence and revealing higher harmonics of the Aharonov-Bohm effect.

Contribution

It shows that increasing magnetic fields extend phase coherence length in graphene rings by reducing spin flip scattering, leading to observable higher harmonics.

Findings

Higher harmonics appear at increased magnetic fields.

Magnetic fields reduce spin flip scattering.

Enhanced phase coherence length observed.

Abstract

The influence of high magnetic fields on coherent transport is investigated. A monolayer graphene quantum ring is fabricated and the Aharonov-Bohm effect is observed. For increased magnitude of the magnetic field higher harmonics appear. This phenomenon is attributed to an increase of the phase coherence length due to reduction of spin flip scattering.