Nanowerk July 19, 2021
The quantum Hall effect is the seminal example of topological protection as charge carriers are transmitted through one-dimensional edge channels where backscattering is prohibited. In conventional Hall bar geometries, topological protection of graphene edge channels is found less robust than in high mobility semi-conductors. An international team of researchers (Belgium, Germany, Japan) exploring graphene quantum Hall regime at the local scale revealed that the detrimental influence of antidots along the graphene edges, mediating backscattering towards upstream edge channels triggering topological breakdown. The finding is a major step forward in the understanding of the quantum Hall effect in graphene, towards the improvement of its measurement, and thus towards its application in metrology and quantum computing…read more. Open Access TECHNICAL ARTICLEÂ
Artist’ view of QHECs at graphene edge. Credit: Nature Communications volume 12, Article number: 4265 (2021)Â