Quantum transport properties of monolayer graphene with antidot lattice

Abstract

Quantum transport properties in monolayer graphene are sensitive to structural modifications. We find that the introduction of a hexagonal lattice of antidots has a wide impact on weak localization and Shubnikov-de Haas (SdH) oscillation of graphene. The antidot lattice reduces both phase coherence and intervalley scattering length. Remarkably, even with softened intervalley scattering, i.e., the phase-breaking time is shorter than intervalley scattering time, coherence between time reversed states remains adequate to retain weak localization, an offbeat and rarely reported occurrence. Whereas SdH oscillation is boosted by the antidot lattice, the amplitude of the SdH signal rises rapidly with the increasing antidot radius. But both effective mass and carrier density are reduced in a larger antidot lattice. A bandgap of ∼10 meV is opened. The antidot lattice is an effective dopant-free way to manipulate electronic properties in graphene.