Van der Waals interaction in magnetic bilayer graphene nanoribbons

Abstract

We study the interaction energy between two graphene nanoribbons by first principles calculations, including van der Waals interactions and spin polarization. For ultranarrow zigzag nanoribbons, the direct stacking is even more stable than Bernal, competing in energy for wider ribbons. This behavior is due to the magnetic interaction between edge states. We relate the reduction of the magnetization in zigzag nanoribbons with increasing ribbon width to the structural changes produced by the magnetic interaction, and show that when deposited on a substrate, zigzag bilayer ribbons remain magnetic for larger widths.

7 pages, 6 figures

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• Electronic conductance of twisted bilayer nanoribbon flakes
• Fluorine absorption on single and bilayer graphene: Role of sublattice and layer decoupling
• Interlayer interaction controlling the properties of AB- and AA-stacked bilayer graphene-like BC${}_{14}$N and Si${}_2$C${}_{14}$
• Stacking-configuration-enriched essential properties in bilayer silicenes
• Topologically protected gap states and resonances in gated trilayer graphene
• Single layer graphene with electronic properties as gated bilayer
• Anomalous exchange interaction between intrinsic spins in conducting graphene systems