Tunable resonances due to vacancies in graphene nanoribbons

Abstract

The coherent electron transport along zigzag and metallic armchair graphene nanoribbons in the presence of one or two vacancies is investigated. Having in mind atomic scale tunability of the conductance fingerprints, the primary focus is on the effect of the distance to the edges and inter vacancies spacing. An involved interplay of vacancies sublattice location and nanoribbon edge termination, together with the spacing parameters lead to a wide conductance resonance line shape modification. Turning on a magnetic field introduces a new length scale that unveils counter-intuitive aspects of the interplay between purely geometric aspects of the system and the underlying atomic scale nature of graphene.

arXiv comment9 pages, 8 figures, figure and references added

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• Conductance signatures of electron confinement induced by strained nanobubbles in graphene
• Coulomb charging energy of vacancy-induced states in graphene
• Quasi-bound states and Fano effect in T-shaped graphene nanoribbons
• Emergence of bound states in ballistic magnetotransport of graphene antidots
• Effective contact model for geometry-independent conductance calculations in graphene
• Tunable transmission due to defects in zigzag phosphorene nanoribbons
• Protected edge states in silicene antidots and dots in magnetic field
• Double-Fano resonance in a two-level quantum system coupled to zigzag Phosphorene nanoribbon
• Impact of electron-electron interactions on the thermoelectric efficiency of graphene quantum point contacts