Single-Valley Engineering in Graphene Superlattices

Abstract

The two inequivalent valleys in graphene preclude the protection against inter-valley scattering offered by an odd-number of Dirac cones characteristic of Z2 topological insulator phases. Here we propose a way to engineer a chiral single-valley metallic phase with quadratic crossover in a honeycomb lattice through tailored \sqrt{3}N *\sqrt{3}N or 3N *3N superlattices. The possibility of tuning valley-polarization via pseudo-Zeeman field and the emergence of Dresselhaus-type valley-orbit coupling are proposed in adatom decorated graphene superlattices. Such valley manipulation mechanisms and metallic phase can also find applications in honeycomb photonic crystals.

5 pages, 3 figures + supplemental materials

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Cited by in corpus (20)

• Topological Phases in Two-Dimensional Materials: A Brief Review
• Phonon Magnetic Moment from Electronic Topological Magnetization
• Valley-momentum locking in a graphene superlattice with Y-shaped Kekulé bond texture
• Valley engineering by strain in Kekulé-distorted graphene
• Designing multi-directional energy-splitters and topological valley supernetworks
• Mass inversion in graphene by proximity to dichalcogenide monolayer
• Triggering a global density wave instability in graphene via local symmetry-breaking
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• Proximity induced quantum anomalous Hall effect in graphene/EuO hetero-structures
• Resonant transport in Kekule-distorted graphene nanoribbons
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