Structural dependence of quantum transport properties on topological nodal-line semimetal bilayer borophene

TL;DR

This study investigates how the topological nodal-line structure influences the electronic transport in bilayer borophene nanoribbons, revealing size-dependent conductance oscillations and strain-tunable transport channels.

Contribution

It introduces a tight-binding model fitted to ab initio data and analyzes the impact of topological features and strain on transport properties of bilayer borophene nanoribbons.

Findings

Conductance increases with ribbon width due to the nodal line.

Narrow nanoribbons show oscillations in conductance and pronounced edge states.

Uniaxial strain can modulate the number of transport channels.

Abstract

This work presents the electronic and transport properties of bilayer borophene nanoribbons. In the first part, a four-orbital tight-binding model is derived by fitting the \emph{ab initio} band structure. The transport properties of armchair and zigzag bilayer borophene nanoribbons are then analyzed, both with and without periodic boundary conditions. In both scenarios, the nodal line causes conductance to increase with width and exhibit oscillations in narrow nanoribbons. Additionally, plots of current and charge density reveal that edge states have a more pronounced impact in narrower nanoribbons. Finally, uniaxial tensile strain is introduced as a tool to engineer the number of available transport channels.