Transport properties of graphene nanoribbon heterostructures

TL;DR

This paper investigates the electronic and transport properties of armchair graphene nanoribbon heterostructures, revealing interface states and the impact of external edge perturbations on conductance.

Contribution

It introduces a detailed analysis of heterostructure geometry effects and external perturbations on conductance using a tight-binding and Green's function approach.

Findings

Interface states and bound states in the continuum are observed.

Heterostructure geometry strongly influences electronic states.

External edge perturbations significantly affect conductance.

Abstract

We study the electronic and transport properties of heterostructures formed by armchair graphene nanoribbons with intersections of finite length. We describe the system by a tight-binding model and calculate the density of states and the conductance within the Green's function formalism based on real-space renormalization techniques. We show the apparition of interface states and bound states in the continuum which present a strong dependence of the heterostructure geometry. We investigate the effects on the conductance of an external perturbation applied on the edges atoms of the intersection region.