Chiral properties of graphene h-BN hybrid systems

The application of the chiral decomposition procedure to hybrid graphene h-BN systems revealed rules for the partition of the system into effective subsystems being bilayers plus monolayer in case the number of layers is odd. Three types of subsystems have been detected namely purely graphene bilayers and monolayers, mixed bilayers and pure h-BN monolayers depending on the hybrid composition. The effective parameters characterizing these chiral subsystems consist of the interlayer couplings and on-site potentials which shows the mechanism of compensation of the asymmetry introduced into the system by h-BN layers. For illustration, we provide a detailed overview about chiral tunneling in graphene subsystems present in hybrid with one h-BN layer. We have established the parameter ranges for which the characteristic features in the spectrum are observed, such as Fabry-Perot resonances in the case of graphene monolayer and “magic angles” in the case of effective graphene bilayer. We also consider different hybrid stacking in order to indicate effective systems with the desired properties required in the electronic and spintronic applications. We show that h-BN layers can promote specific graphene properties.