Interface states and anomalous quantum oscillations in graphene hybrid structures

TL;DR

This study explores hybrid graphene structures combining one- and two-layer regions, revealing unique interface states and anomalous quantum oscillations that could impact future electronic applications.

Contribution

It is the first detailed investigation of continuous graphene hybrids, uncovering novel interface states and quantum phenomena not observed in separate layers.

Findings

Discovery of two sets of Landau levels in bulk hybrids.

Observation of suppressed quantum oscillations in edge hybrids.

Identification of chiral interface states at the graphene junctions.

Abstract

One- and two-layer graphene have recently been shown to feature new physical phenomena such as unconventional quantum Hall effects and prospects of supporting a non-silicon technological platform using epitaxial graphene. While both one- and two-layer graphene have been studied extensively, continuous sheets of graphene possessing both parts have not yet been explored. Here we report a study of such graphene hybrid structures. In a bulk hybrid featuring two large-area one- and two-layer graphene and an interface between them, two sets of Landau levels and features related to the interface were found. In edge hybrids featuring a large two-layer graphene with narrow one-layer graphene edges, we observed an anomalous suppression in quantum oscillation amplitude due to the locking of one- and two-layer graphene Fermi energies and emergent chiral interface states. These findings demonstrate the importance of these hybrid structures whose unique interface states and related phenomena deserve further studies.