Anomalous Cyclotron Motion in Graphene Superlattice Cavities

TL;DR

This paper reveals that graphene superlattice miniband fermions exhibit unconventional trajectories, including straight segments at low magnetic fields, challenging traditional cyclotron motion understanding and opening new avenues in electron optics.

Contribution

It uncovers the anomalous cyclotron motion of miniband fermions in graphene superlattices through combined experimental and simulation analysis.

Findings

Dirac quasiparticles follow non-conventional trajectories

Low magnetic field dynamics show straight trajectory segments

Results suggest new electron optics applications

Abstract

We consider graphene superlattice miniband fermions probed by electronic interferometry in magneto-transport experiments. By decoding the observed Fabry-P\'erot interference patterns together with our corresponding quantum transport simulations, we find that the Dirac quasiparticles originating from the superlattice minibands do not undergo conventional cyclotron motion but follow more subtle trajectories. In particular, dynamics at low magnetic fields is characterized by peculiar, straight trajectory segments. Our results provide new insights into superlattice miniband fermions and open up novel possibilities to use periodic potentials in electron optics experiments.