Theoretical Study of Fano Resonance in Single-Walled Carbon Nanotubes

TL;DR

This paper presents a theoretical analysis of Fano resonances in single-walled carbon nanotubes, showing how asymmetric conductance peaks depend on electrode coupling symmetry and interference effects.

Contribution

It introduces a model explaining the emergence of Fano resonances in SWNTs based on coupling symmetry and interference, advancing understanding of quantum transport phenomena.

Findings

Asymmetric Fano resonances occur with non-axially symmetric coupling.

Symmetric coupling results in no asymmetric resonance peaks.

Resonance features are highly sensitive to electrode coupling symmetry.

Abstract

Electrical transport through single-walled carbon nanotubes (SWNTs) is investigated by using the nearest-neighbor tight-binding model coupled with two electron reservoirs. When the SWNT-electrode coupling is not axially symmetric, asymmetric resonance peaks are found in the conductance and are considered to be due to the interference between two transport channels. These Fano resonances are sensitive to the coupling with electrodes. When the coupling is axially symmetric, no asymmetric resonance peaks are observed.