Quantum electron transport in toroidal carbon nanotubes with metallic leads

TL;DR

This study uses a recursive Green's function method to analyze quantum electron transport in a large toroidal carbon nanotube with metallic leads, revealing how lead placement and magnetic flux influence conductance.

Contribution

It introduces a detailed computational approach to study electron transport in large toroidal carbon nanotubes with variable lead configurations and magnetic flux effects.

Findings

Plateaus in transmissivity occur over wide lead placement ranges.

Magnetic flux enhances transmissivity through the torus.

Transmissivity is sensitive to lead angle and magnetic flux variations.

Abstract

A recursive Green's function method is employed to calculate the density-of-states, transmission function, and current through a 150 layer (3,3) armchair nanotorus (1800 atoms) with laterally attached metallic leads as functions of relative lead angle and magnetic flux. Plateaus in the transmissivity through the torus occur over wide ranges of lead placement, accompanied by enhancements in the transmissivity through the torus as magnetic flux normal to the toroidal plane is varied.