I-band-like non-dispersive inter-shell interaction induced Raman lines in the D band region of double-walled carbon nanotubes

TL;DR

This paper predicts non-dispersive Raman lines in double-walled carbon nanotubes caused by inter-shell interactions, extending previous observations in bilayer graphene and based on double resonance theory involving non-zone-centered phonons.

Contribution

It introduces a theoretical prediction of I-band-like Raman features in DWCNTs due to inter-shell interactions, expanding understanding of Raman spectra in layered nanostructures.

Findings

Prediction of non-dispersive Raman lines in DWCNTs

Extension of inter-layer interaction effects from graphene to nanotubes

Use of double resonance theory with non-zone-centered phonons

Abstract

Non-dispersive, inter-layer interaction induced Raman peaks (I bands) -- in the region of the D band -- have been observed recently for bilayer graphene, when the two layers were rotated with respect to each other. Here, similar observations for double-walled carbon nanotubes (DWCNTs) are theoretically predicted. The prediction is based on double resonance theory, involving non-zone-centered phonons, and the effect of disorder is replaced by interaction between the two tubes.