Weak Localization and Transport Gap in Graphene Antidot Lattices

Abstract

We fabricated and measured antidot lattices in single layer graphene with lattice periods down to 90 nm. In large-period lattices, a well-defined quantum Hall effect is observed. Going to smaller antidot spacings the quantum Hall effect gradually disappears, following a geometric size effect. Lattices with narrow constrictions between the antidots behave as networks of nanoribbons, showing a high-resistance state and a transport gap of a few mV around the Dirac point. We observe pronounced weak localization in the magnetoresistance, indicating strong intervalley scattering at the antidot edges. The area of phase-coherent paths is bounded by the unit cell size at low temperatures, so each unit cell of the lattice acts as a ballistic cavity.

some revisions, to appear in New Journal of Physics, Special Issue Graphene

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• Making graphene visible
• Graphene Antidot Lattices - Designed Defects and Spin Qubits
• Weak localisation in graphene flakes
• Symmetry Classes in Graphene Quantum Dots: Universal Spectral Statistics, Weak Localization, and Conductance Fluctuations
• Quantum transport thermometry for electrons in graphene

Cited by in corpus (1)

• Electronic properties of graphene antidot lattices