Quantum blockade and loop current induced by a single lattice defect in graphene nanoribbons

Abstract

We investigate theoretically the electronic transport properties in narrow graphene ribbons with an adatom-induced defect. It is found that the lowest conductance step of a metallic graphene nanoribbon may develop a dip even down to zero at certain values of the Fermi energy due to the defect. Accompanying the occurrence of the conductance dip, a loop current develops around the defect. We show how the properties of the conductance dip depend on the parameters of the defect, such as the relative position and severity of the defect as well as the width and edges of the graphene ribbons. In particular, for metallic armchair-edges graphene nanoribbons, whether the conductance dip appears or not, they can be controlled by choosing the position of the single defect.

6 pages, 6 figures

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Cited by in corpus (11)

• Monolayer honeycomb structures of group IV elements and III-V binary compounds
• Properties of Graphene: A Theoretical Perspective
• Ab initio quantum transport through armchair graphene nanoribbons: Streamlines in the current density
• Charge transport in doped zigzag phosphorene nanoribbons
• Impact of complex adatom-induced interactions on quantum spin Hall phases
• Controllable spin filtering and half metallicity in ${\beta }_{12}$-borophene nanoribbons
• Husimi Maps in Lattices
• Coherent transport of armchair graphene constrictions
• Unconventional charge and spin dependent transport properties of a graphene nanoribbon with line-disorder
• Physical Origin of Current Partition at a Topological Trifurcation
• Husimi Maps in Graphene