Electron transport through symmetrical junctions of semimetal graphene ribbons

TL;DR

This paper provides an analytical model for low-energy electron transport in symmetrical semimetal graphene ribbon junctions, revealing unique transmission behaviors and suppression near the neutrality point, with specific conditions for free transmission.

Contribution

It introduces an analytical description of electron transport in symmetrical graphene ribbon junctions, highlighting conditions for transmission suppression and absence of local interface states.

Findings

Transmission suppression near neutrality point except for specific ribbon configurations

Certain ribbon junctions are free of interface local levels

Electron backscattering scales inversely with the square of p+1

Abstract

Based on the nearest-neighbor tight-binding model, we present analytical description of low-energy electron transport through a symmetrical junction of two semimetal armchair ribbons. The results obtained demonstrate the transmission suppression in the vicinity of the neutrality point except for the junction of the ribbons consisting of 3p-1 and 3p+5 dimer lines, p/2 is odd. Unlike other interconnections, these compounds are shown to be free of even local levels arising at the junction interface and exhibit electron backscattering to be inversely as the square of p+1.